Until their next earnings report, I'll pull $13 out of no where

The stories about 80+% of the ad click-thru coming from bots are scary for them. I wouldn't expect to hold it for long though as long-term they are going to struggle with the pressure to monetize and slowing growth.
The only reason I'd buy at $13 is I imagine they've learned their lesson from last time, when they hit earnings expectations exactly, that the game is to beat expectations. They have enough going on that they can game that number to have a good one in October. In fact I'd say when it gets closer to October it might be a really good buy at even higher prices because they are going to be desperate to report something good by then.