Can I throw in "Clearly, Facebook is in the end-stages of negotiation to acquire Groupon!"? I mean, as long as we're all staring at tea leaves, let's have some fun.
Actually, a partnership with a current deals site I think would be a great idea. Facebook can bring in an audience for free but not have to worry about finding deals.
Can't imagine Facebook would partner with a site. They'd probably try to buy it and then intrgrate it as a feature in Facebook itself.
They partnered with those geolocation sites didn't they?