Bye bye FourSquare...
They have played pretty hard in the virtual currency area too (although if anyone really thought they'd be able to build a business in that area on Facebook then I've got a bridge to sell you)
Facebook can help some apps, but crushes others. I don't think it's at all clear which this will be.
www.gamasutra.com/view/news/27646/GDC_Heckers_Nightmare_Scenario__A_Future_Of_Rewarding_Players_For_Dull_Tasks.php