A Twitter Attack

Yesterday, a person I follow on Twitter was hacked and then I was! The message:

I foolishly tried clicking the link and that must have been the go ahead for the same message to be sent from my account to all my followers. Yuk.

A kind follower alerted me:

I've now changed my password and hope that this is enough to stop the hacker. 

And then I noticed the following tweets:

What the ...? I have no interest in weight loss (the bottom tweet is mine though and has nothing to do with weight loss!)

Have you had the same or similar experience? What did you do?