Recently I have had about six DM's from people saying "Hi someone is saying horrible rumours about you.." it is then followed by a link.
As there seems to be more of this happening, I have got this link below from twitter which has the steps to follow if you think your account has been compromised. I hope this helps out, I have tried to contact some of the people who have been compromised, a couple replied and thanked me for trying to help the other just ignored it.
I am always interested in your thoughts so if you have any comments or feedback then please feel free to add any comments, or you can mail me here.