I wouldn't recommend Google Enterprise / GoogleApps (@googleatwork) - you can't import contacts to facebook, twitter and other social networks. Simple Gmail accounts integrate much better.

@googleatwork, would you provide a simple option for GoogleApps email to be compatible with social networks?

Suggested solution

Allow to access my googleapps email via the regular gmail interface.

For example, if I have installed GoogleApps on example.com, and added the me@example.com account to Google Apps, allow to access it by entering an account named 'me.example.com' on the regular gmail.