There have been hackings in the system, I'm afraid. People who's accounts have been hacked will have journals titled "I don/t remember making this journal" and they will have a link with something to the line of click here to report this guy.

Don't click the link. :3 It is as simple as that.

EDIT: Apparently it is more than that title, but that is all I have incountered. :3 JUST DON'T CLICK THE LINKS.