Using error name in my Twitter

Yeah my twitter was hacked and someone change my user name starts with error and even the link of website to porn site. That's not all even sending message to blogger friends with bad message.

You think that's all the person did. Not really, this person is so free even got into my social networking account such as digg and SU. Both accounts is not available any more!

The person even manage to go in my photobucket account to delete all the pics there. Indeed this person is very busy with my accounts. Who is it? I have no idea.

Yeah my computer still having virus which needed to be clean. Is that the caused of hacking?