My concerns are that there are certain lets say entities that just bought a ton of Zuck and friends stock that were recently dumped on to the market - now that said I can't imagine that they want the stock to drop just quite yet? I can't help but feel that they might use earnings to drive it up and then sell if off to guess who - dummies like US! Only a thought so beware of the Wall Cheaters and their tricks!
If you're in for the long term and nothing fundamentally changes it doesn't matter. That said, I don't think the stock is overly inflated - it is justifiably inflated (based on current PE vs expected growth rate). And not all stocks sell off, they just keep going up. Stay tuned.....we'll know soon enough.