A malicious Facebook app that acts like a human (eg. adding friends, etc)
A Facebook human that acts like a robot. Facebots deal directly with Facebook and not with the people on it. They only know what's going on in your life if they get a Notification about it; they write to their wall instead of talking to you.
Congrats on your new baby, can't believe I had to find out about it on here, thanks facebot! :(