The act of intentionally misrepresenting your appearance on Facebook to hide that you are fat. This person will engage in the act of photo manipulation such as cropping out anything below the shoulders in pictures. The lower half of their body would show that they are clearly not hot, but they are more concerned with keeping up with appearances on Facebook than hitting an elliptical.
When someone does something on Facebook just to make a point, or have everyone else see it. Can be done by a status, or joining of a group. Usually not a direct comment or wall post.
When someone new as joined facebook, and he/she does not have many friends, wallposts or photos. In most cases, this is a relativelyshort period of time, before the 'facebookling' grows out of control into a Self-Mutating-Facebook-Monstrosity.