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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.
Twitter makes it easy to opt into or out of networks.
Once the friendship is confirmed all the people in your friends' Friend Space become part of your network.
In that sense, everyone on My Space is in your Extended Network.
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.