If you look back a couple weeks I said the stock would settle down after it was released. It may drop to half, it may drop to a couple bucks. People just have to decide where they think the bottom is and buy when they're comfortable.
Facebook is only worth as much as the amount of advertising revenue they can bring in. They're losing GM which is a big client, and others may follow. From what I hear the are thinking about charging a monthly fee to use FB. Something like $2 per month, but they currently have over 900 million registered users, and if they can keep even half of that number at $2 per month, that's a shitload of cash.
Stay tuned!