Help? Someone is writing Turkish messages from my Facebook account

Somehow someone wrote the message

"bu kimin facesi lan ne ariyor aq telimde"

from my Facebook account at 6:52 A.M. Pacific Time via "Mobile Web." I don't know Turkish so it couldn't have been me that wrote it (though Google Translate says it means "what is this man who is searching for faces telimde aq").

I went to Facebook's Help Center and clicked on Security. It disabled my account until I changed my password, which I did. Under the list of recent logins, nothing showed up around 6:52 A.M.

This is kind of irksome. Can someone at Facebook please fix this? My user ID is 82.

I'd e-mail customer service except that I've done that before and it's been totally useless (much like the Security page).