Wikipedia is a multilingual, Web-based, free-content encyclopedia project. The name Wikipedia is a portmanteau (a combination of portions of two words and their meanings) of the words wiki (a type of collaborative Web site) and encyclopedia. Wikipedia's articles provide links to guide the user to related pages with additional information. (...)
Founded in February 2005, YouTube is the leader in online video, and the premier destination to watch and share original videos worldwide through a Web experience. YouTube allows people to easily upload and share video clips on www.YouTube.com and across the Internet through websites, mobile devices, blogs, and email. (...)
Flickr - almost certainly the best online photo management and sharing application in the world - has two main goals (...):
We want to help people make their content available to the people who matter to them.
We want to enable new ways of organizing photos and video.
