Facebook: A social networking site originally designed for university students and employees in the U.S. It has since spread to other areas, including friends, schools and geographic areas. It is a social network where users communicate by creating a personal profile.
Twitter: A social networking and micro blogging service that allows users to send and read other users' text-based updates (up to 140 characters).The messages displayed on the user profile page and received by others who have chosen to subscribe to this particular user's messages.
YouTube: A site where users can upload, view and share videos.YouTube uses Adobe Flash to view the content, which includes clips from movies and TV shows, music videos and homemade videos.YouTube is among the fastest growing sites on the Internet.
LinkedIn: Is a business-oriented social network.The community used to gather professional contacts and business relationships, find jobs, employ, and to be discovered. LinkedIn is free to use, but you can upgrade to paid service. If you look at Facebook as more private LinkedIn is more professional.
Flickr: An online service where users upload photos and share them with others.The emphasis on the visual. Latest photo upload will always be first on the user side, but you can organize your photos as you want in an album, called "sets".
Digg: A site for community news and issues. Diggs main function is to let users vote news and issues up or down. Only the most popular ports on the front page updates. Digg's success has led to a number of other sites with similar functionality has been created.
Delicious: A web service for social bookmarking.This means that online users can store, share and explore other users' bookmarks to web pages. Share.Icio.us classify your bookmarks for a non-hierarchical system where users can classify ("tag") categories for each of their bookmarks.
WordPress: is an open source CMS tools for blog publishing built on PHP and MySQL. WordPress has many features including plug-in architecture and template system. WordPress is used by over 300 of the 10 000 largest websites in the world and is the most popular blogging software used today.
