A Lot of Facebook accounts are being hacked recently. It's a good idea to change your Facebook password.
Hackers put on spam as you and some of it you sure don't want people to think it's coming from you. BTW it does not show up on your timeline so you don't see it. Just go to your home page and hit the gear in the upper right.
Remember passwords with letters and numbers small case and upper and special keys are the hardest to crack. Be sure to safely save your passwords. That means don't name a file "All my Passwords" and put it in my documents folder. Only saying cause people do ... LOL.