Selasa, 04 Januari 2011
Open Directory Project
The Open Directory Project (ODP), also known as Dmoz (from directory.mozilla.org, its original domain name), is a multilingual open content directory of World Wide Web links. It is owned by Netscape but it is constructed and maintained by a community of volunteer editors.
ODP uses a hierarchical ontology scheme for organizing site listings. Listings on a similar topic are grouped into categories which can then include smaller categories.
ODP was founded in the United States as Gnuhoo by Rich Skrenta and Bob Truel in 1998 while they were both working as engineers for Sun Microsystems. Chris Tolles, who worked at Sun Microsystems as the head of marketing for network security products, also signed on in 1998 as a co-founder of Gnuhoo along with co-founders Bryn Dole and Jeremy Wenokur. Skrenta had developed TASS, an ancestor of tin, the popular threaded Usenet newsreader for Unix systems. Coincidentally, the original category structure of the Gnuhoo directory was based loosely on the structure of Usenet newsgroups then in existence.
The Gnuhoo directory went live on June 5, 1998. After a Slashdot article suggested that Gnuhoo had nothing in common with the spirit of free software, for which the GNU project was known, Richard Stallman and the Free Software Foundation objected to the use of Gnu. So Gnuhoo was changed to NewHoo. Yahoo! then objected to the use of "Hoo" in the name, prompting them to switch the name again. ZURL was the likely choice. However, before the switch to ZURL, NewHoo was acquired by Netscape Communications Corporation in October 1998 and became the Open Directory Project. Netscape released the ODP data under the Open Directory License. Netscape was acquired by AOL shortly thereafter and ODP was one of the assets included in the acquisition. AOL later merged with Time-Warner.
Gnuhoo borrowed the basic outline for its initial ontology from Usenet. For example, the topic covered by the comp.ai.alife newsgroup was represented by the category Computers/AI/Artificial_Life. The original divisions were for Adult, Arts, Business, Computers, Games, Health, Home, News, Recreation, Reference, Regional, Science, Shopping, Society and Sports. While these fifteen top-level categories have remained intact, the ontology of second- and lower-level categories has undergone a gradual evolution; significant changes are initiated by discussion among editors and then implemented when consensus has been reached.
ODP uses a hierarchical ontology scheme for organizing site listings. Listings on a similar topic are grouped into categories which can then include smaller categories.
The Gnuhoo directory went live on June 5, 1998. After a Slashdot article suggested that Gnuhoo had nothing in common with the spirit of free software, for which the GNU project was known, Richard Stallman and the Free Software Foundation objected to the use of Gnu. So Gnuhoo was changed to NewHoo. Yahoo! then objected to the use of "Hoo" in the name, prompting them to switch the name again. ZURL was the likely choice. However, before the switch to ZURL, NewHoo was acquired by Netscape Communications Corporation in October 1998 and became the Open Directory Project. Netscape released the ODP data under the Open Directory License. Netscape was acquired by AOL shortly thereafter and ODP was one of the assets included in the acquisition. AOL later merged with Time-Warner.
Content
Gnuhoo borrowed the basic outline for its initial ontology from Usenet. For example, the topic covered by the comp.ai.alife newsgroup was represented by the category Computers/AI/Artificial_Life. The original divisions were for Adult, Arts, Business, Computers, Games, Health, Home, News, Recreation, Reference, Regional, Science, Shopping, Society and Sports. While these fifteen top-level categories have remained intact, the ontology of second- and lower-level categories has undergone a gradual evolution; significant changes are initiated by discussion among editors and then implemented when consensus has been reached.
In July 1998, the directory became multilingual with the addition of the World top-level category. The remainder of the directory lists only English language sites. By May 2005, seventy-five languages were represented. The growth rate of the non-English components of the directory has been greater than the English component since 2002. While the English component of the directory held almost 75% of the sites in 2003, the World level grew to over 1.5 million sites as of May 2005, forming roughly one-third of the directory. The ontology in non-English categories generally mirrors that of the English directory, although exceptions which reflect language differences are quite common.
Several of the top-level categories have unique characteristics. The Adult category is not present on the directory homepage but it is fully available in the RDF dump that ODP provides. While the bulk of the directory is categorized primarily by topic, the Regional category is categorized primarily by region. This has led many to view ODP as two parallel directories: Regional and Topical.
Mozzie, DMOZ's mascot
On November 14, 2000, a special directory within the Open Directory was created for people under 18 years of age. Key factors distinguishing this "Kids and Teens" area from the main directory are:
* stricter guidelines which limit the listing of sites to those which are targeted or "appropriate" for people under 18 years of age;
* category names as well as site descriptions use vocabulary which is "age appropriate";
* age tags on each listing distinguish content appropriate for kids (age 12 and under), teens (13 to 15 years old) and mature teens (16 to 18 years old);
* Kids and Teens content is available as a separate RDF dump;
* editing permissions are such that the community is parallel to that of the Open Directory.
By May 2005, this portion of the Open Directory included over 32,000 site listings.
Since early 2004, the whole site has been in UTF-8 encoding. Prior to this, the encoding used to be ISO 8859-1 for English language categories and a language-dependent character set for other languages. The RDF dumps have been encoded in UTF-8 since early 2000.
Directory listings are maintained by editors. While some editors focus on the addition of new listings, others focus on maintaining the existing listings. This includes tasks such as the editing of individual listings to correct spelling and/or grammatical errors, as well as monitoring the status of linked sites. Still others go through site submissions to remove spam and duplicate submissions.
Robozilla is a Web crawler written to check the status of all sites listed in ODP. Periodically, Robozilla will flag sites which appear to have moved or disappeared and editors follow up to check the sites and take action. This process is critical for the directory in striving to achieve one of its founding goals: to reduce the link rot in web directories. Shortly after each run, the sites marked with errors are automatically moved to the unreviewed queue where editors may investigate them when time permits.
Due to the popularity of the Open Directory and its resulting impact on search engine rankings (See PageRank), domains with lapsed registration that are listed on ODP have attracted domain hijacking, an issue that has been addressed by regularly removing expired domains from the directory.
While corporate funding and staff for the ODP have diminished in recent years, volunteers have created editing tools such as linkcheckers to supplement Robozilla, category crawlers, spellcheckers, search tools that directly sift a recent RDF dump, bookmarklets to help automate some editing functions, mozilla based add-ons, and tools to help work through unreviewed queues.
YAHOO
Yahoo! was founded by Jerry Yang and David Filo in January 1994 and was incorporated on March 1, 1995. On January 13, 2009, Yahoo! appointed Carol Bartz, former executive chairperson of Autodesk, as its new chief executive officer and a member of the board of directors.
Storing personal information and tracking usage
Storing personal information and tracking usage
Working with comScore, The New York Times found that Yahoo! is able to collect far more data about Web users than its competitors from its Web sites and its advertising network. By one measure, on average Yahoo! had the potential in December 2007 to build a profile of 2,500 records per month about each of its visitors.
As of May 22, 2008, An article in computer world states that Yahoo has a 2-petabyte, specially built data warehouse, which it uses to analyze the behavior of its half-billion Web visitors per month, processing 24 billion events a day. Yahoo Claimed it is expected to grow in multiples of 10 petabytes by 2009 and that this database is the largest in the world. In contrast the internal revenue services database of all taxpayers weighs in at only 150 TB.
As of December 18, 2008, Yahoo! retains search requests for a period of 13 months. However, In response to European Regulators Yahoo scrambles the last eight digits of a users IP address after three months, rendering them partially anonymous.
Yahoo! provides Internet communication services such as Yahoo! Messenger and Yahoo! Mail. In March 2007, Yahoo! announced that their e-mail service would offer unlimited storage beginning May 2007.
Yahoo! also offers social networking services and user-generated content in products such as My Web, Yahoo! Personals, Yahoo! 360°, Delicious, Flickr and Yahoo! Buzz.
Yahoo! Photos was shut down on September 20, 2007, in favor of Flickr. On October 16, 2007, Yahoo! announced that they would no longer provide support or perform bug fixes on Yahoo! 360° as they intended to abandon it in early 2008 in favor of a "universal profile" that will be similar to their Mash experimental system.
Yahoo! partners with numerous content providers in products such as Yahoo! Sports, Yahoo! Finance, Yahoo! Music, Yahoo! Movies, Yahoo! News, Yahoo! Answers and Yahoo! Games to provide media content and news. Yahoo! also provides a personalization service, My Yahoo!, which enables users to combine their favorite Yahoo! features, content feeds and information onto a single page.
On March 31, 2008, Yahoo! launched Shine, a site tailored for women seeking online information and advice between the ages of 25 and 54.
Co-branded Internet services
Yahoo! has developed partnerships with different broadband providers such as AT&T (via BellSouth & SBC), Verizon Communications, Rogers Communications and British Telecom, offering a range of free and premium Yahoo! content and services to subscribers.
Mobile Services
Yahoo! Mobile offers services for on-the-go messaging, such as email, instant messaging and mobile blogging; information services, search and alerts; entertainment, ring tones, and Yahoo! Photos for camera phones.
Yahoo! also introduced its Internet search system, called oneSearch, developed for mobile phones on March 20, 2007. The company's officials stated that in distinction from ordinary Web searches, Yahoo!'s new service presents a list of actual information, which may include: news headlines, images from Yahoo!'s Flickr photos site, business listings, local weather and links to other sites. Instead of showing only, for example, popular movies or some critical reviews, oneSearch lists local theaters that at the moment are playing a certain movie, user ratings and news headlines regarding the movie. A zip code or city name is required for Yahoo! oneSearch to start delivering local search results.
The results of a Web search are listed on a single page and are prioritized into categories. The list of results is based on calculations that Yahoo! computers make on certain information the user is seeking.
Yahoo! uses Novarra's mobile content transcoding service for the oneSearch platform.
On October 8, 2010, Yahoo! announced plans to brings video chat to iPhones and Android-based phones via its popular Yahoo Messenger instant messaging service.
Commerce
Yahoo! offers commerce services such as Yahoo! Shopping, Yahoo! Autos, Yahoo! Real Estate and Yahoo! Travel, which enables users to gather relevant information and make commercial transactions and purchases online. Yahoo! Auctions were discontinued in 2007 except for Asia.
Small business
The Small Business homepage as of August 2010
Yahoo! provides services such as Yahoo! Domains, Yahoo! Web Hosting, Yahoo! Merchant Solutions, Yahoo! Business Email and Yahoo! Store to small business owners and professionals allowing them to build their own online stores using Yahoo!'s tools.
Yahoo! also offers HotJobs to help recruiters find the talent they seek.
Advertising
Yahoo! Search Marketing provides services such as Sponsored Search, Local Advertising, and Product/Travel/Directory Submit that let different businesses advertise their products and services on the Yahoo! network. Yahoo! Publisher Network is an advertising tool for online publishers to place advertisements relevant to their content to monetize their websites.
Yahoo! launched its new Internet advertisement sales system on February 5, 2007, called Panama. It allows advertisers to bid for search terms based on their popularity to display their ads on search results pages. The system takes bids, ad quality, click-through rates and other factors into consideration in determining how ads are ranked on search results pages. Through Panama, Yahoo! aims to provide more relevant search results to users, a better overall experience, as well as increase monetization—to earn more from the ads it shows.
On April 7, 2008, Yahoo! announced APT from Yahoo!, which was originally called AMP! from Yahoo!, an online advertising management platform. The platform seeks to simplify advertising sales by unifying buyer and seller markets. The service was launched in September 2008.
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