Popular web 2.0 applications

Here are some popular web 2.0 applications:

• Flickr
  Flickr is a photo sharing application.
  Link: http://www.flickr.com/
• YouTube
  YouTube is a video sharing application.
  Link: http://www.youtube.com/
• Twitter
  Twitter is a public message-oriented application.
  Link: http://www.twitter.com/
• Facebook
  The largest free social networking site in the world.
  Link: http://www.facebook.com/
• Yelp
  Yelp is a free online tool to create public reviews of anything such as movie, restaurant or bar etc.
  Link: http://www.yelp.com/
• De.licio.us
  De.licio.us is a free bookmarking site.
  Link: http://www.del.icio.us/
• SlideShare
  SlideShare is a website use for sharing various types of files such pdf, powerpoint presentations, documents etc.
  Link: http://www.slideshare.net/