Sometimes you feel that you have to many accounts on the internet, and you become confused and unstuck in time (Vonnegut 1).
Fuser, is a site that can manage all your e-mails together with your social networking comments, wall posts and messages in an inbox. For example, you get e-mail from gmail and Yahoo! Mail, as well as someone just post something on the wall of your facebook, you'll get all the message inside the inbox in fuser.
For social networking, only three services are available - Facebook and MySpace. But, you can post on your friends wall to facebook and write comments on your friends on MySpace from fuser. You can also update you twitter message from there.
Note that all messages you delete from fuser would also be deleted in your original account. This is a good syncronization. All in all, you may try using fuser, and if you dislike fuser, you may leave comment here to tell others about its limitation.
Fuser link - https://fuser.com/fuser.aspx