OK, I know that English is a living language. It changes as our culture changes. I'm OK with "email" and "fax" and "bungee". Really.
However, Facebook is not a verb. Sorry, kids, it's not, and it never will be.
You don't taco, you eat a taco.
You don't magazine, you read a magazine.
Hell, pick any verb - you can read, check, use, post on, devour, obsess over, avoid, follow, or accept Facebook, but you cannot Facebook Facebook.