You can build your network of contacts, and invite others to receive your Tweets, and can follow other members' posts.
Twitter makes it easy to opt into or out of networks.
As part of terms of My Space, the user must be at least 14 years old to register. Twitter: Twitter is a very simple service that is rapidly becoming one of the most talked-about social networking service providers.
When you have a Twitter account, you can use the service to post and receive messages to a network of contacts, as opposed to send bulk email messages.
The site lets you connect with old friends and make new ones using a unique user interface.
The site boasts users from more than a dozen countries, including the United States, Australia, Canada, Poland, France and Germany. Friendster: Friendster was one of the first Web sites to bring it into mass culture.
Most of the users of Habbo are between the age group of 13 - 18 years.
However, it went beyond just a one-way communication.
You can update the profile with your education and job details and a summary.
Additionally, you can also give and receive recommendations from co-workers and bosses.
To start using Linked In you need to register and create a profile page.
To register to Linked In, you need to provide personal information.
You can meet others in public rooms (nightclubs, restaurants, shops) and create private rooms for selected friends.