Facebook!
Facebook is a social networking site and website, Users can create profiles with photos, lists of personal interests, contact information and other personal information. Communicating with friends and other users can be done through private or public messages or a chat feature. Users can also create and join interest groups and "like pages" , you can update your status, comment on other peoples ETC. Automatic notifications show up if some 1 has commented on something. You can also advertise on facebook and play games.
Google applications!
Google Apps is a service from Google providing independently customizable versions of several Google products under a custom domain name. It features several Web applications with similar functionality to traditional office suites, including: G mail, Google Groups, Google Wave, Google Calendar, Talk, Docs and Sites.
The Standard Edition is free and offers the same amount of storage as regular G mail accounts.[1] The Premier Edition, which offers additional e-mail storage, is available for an annual fee. The Education Edition, which is free, combines features from the Standard and Premier editions.
Myspace!
MySpace is a social networking website, Find friends & classmates, meet new people, listen to free music & build playlists, share photos, watch videos, ...