Facepressing
Using Facebook to lie about how awesome you are so people think you're cool when you're actually a dud. You post stuff just to look good.
I posted a picture of me eating a whole pizza by myself at 2 AM. No one asked me why I was eating alone.
I commented on a post like I knew what the person was talking about, but I had no idea.
I took a quiz that said I was a 'sexy thigh' and posted it like it was a big deal.