facebook know it all
Those Facebook users who think they're the best at everything, and they'll argue about it with you even if they have no idea what they're talking about.
I know everything about sports. I read it on Facebook. I don’t need to watch the game.
I told my teacher I knew everything about history. I said, 'I read it on Facebook.'
They asked me if I knew what inflation was. I said, 'It’s when prices go up. I think that’s it.'