The world is made up of people all pretending that they know more than others so they can support their ego, feel relevant and valid I guess. I'm not on Facebook but it happens all the time there and on other social medias, in the workplace, social clubs and anywhere else people congregate together.

There's a word for it: Pretenderisactioning.

Ok, I just made that shit up.

On another note, I sometimespretend I don't know something just so the other person I'm with at the time can feel a certain way, tell me some stuff. It can help to get them talking and opening up.