I dont know, Thursday looked like I blow off top. Then Friday you had larger than usual volume and a close below the open on Monday. This is normally something kind of bearish. FB is a 20-30 dollar stock as soon as they report good earnings, but there are some good arguments for why its priced right at 15.
The PE is way too high, for a company that actually has a customer base kind of tapering off. They will need to do something to show why it can maintain a 100B valuation, i.e. it needs 30-40B a year in revenue and 2-3B a year in profit. Last year almost 4B in revenue. Needs a good surge to justify anything over 20 share at this point.