Facebook is a social networking website intended to connect friends, family, and business associates. It is the largest of the networking sites, with the runner up being MySpace. It began as a college networking website and has expanded to include anyone and everyone.
Facebook was founded by 2004 by Harvard student Mark Zuckerberg and originally called thefacebook. It was quickly successful on campus and expanded beyond Harvard into other Ivy League schools. With the phenomenon growing in popularity, Zuckerberg enlisted two other students, Duston Moskovitz and Chris Hughes, to assist. Within months, thefacebook became a nationwide college networking website.
Twitter is a website, owned and operated by Twitter Inc., which offers a social networking and microblogging service, enabling its users to send and read messages called tweets. Tweets are text-based posts of up to 140 characters displayed on the user's profile page. Tweets are publicly visible by default; however, senders can restrict message delivery to just their followers. Users may subscribe to other users' tweets – this is known as following and subscribers are known as followers. All users can send and receive tweets via the Twitter website, compatible external applications (such as for smartphones), or by Short Message Service (SMS) available in certain countries. While the service is free, accessing it through SMS may incur phone service provider fees. The website is based in San Francisco, California. Twitter also has servers and offices in San Antonio, Texas, and Boston, Massachusetts.
A blog (a blend of the term web log) is a type of website or part of a website. Blogs are usually maintained by an individual with regular entries of commentary, descriptions of events, or other material such as graphics or video. Entries are commonly displayed in reverse-chronological order. Blog can also be used as a verb, meaning to maintain or add content to a blog.
Most blogs are interactive, allowing visitors to leave comments and even message each other via widgets on the blogs and it is this interactivity that distinguishes them from other static websites. Many blogs provide commentary or news on a particular subject; others function as more personal online diaries. A typical blog combines text, images, and links to other blogs, Web pages, and other media related to its topic. The ability of readers to leave comments in an interactive format is an important part of many blogs. Most blogs are primarily textual, although some focus on art (art blog), photographs (photoblog), videos (video blogging), music (MP3 blog), and audio (podcasting). Microblogging is another type of blogging, featuring very short posts.
YouTube is a video-sharing website on which users can upload, share, and view videos, created by three former PayPal employees in February 2005. The company is based in San Bruno, California, and uses Adobe Flash Video technology to display a wide variety of user-generated video content, including movie clips, TV clips, and music videos, as well as amateur content such as video blogging and short original videos. Most of the content on YouTube has been uploaded by individuals, although media corporations including CBS, BBC, Vevo and other organizations offer some of their material via the site, as part of the YouTube partnership program.
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