I just checked out my twitter account and someone seems to have hacked it. They have been tweeting stuff like :
Hello, this might be my last tweet! i found a better place to meet people online!
Hello , just wanted to let everyone know that Im barely going to use twitter anymore. This new social network is so much better and hot …
I use twitter from the net and also have added a firefox twitter add on which I also use to tweet.
I have changed my password now.. hope it works

Update: My account has now been suspended due to suspicious activity.