Facebook has a few things up their sleeve, a version of Adsense could be one. 600 million users check in daily, there's value in that, just need some creativity.

I am not sure if Google is worth a 24PE, their pages are already full of ads. For how will that go? They're begging to be disrupted by a Google without the (current) need to put 5-20 ads before real results. Before you even say it: "Relevant" isn't best