[smparkes]

I find it a little disconcerting that the two primary things CL makes money from, housing and jobs, don't (obviously) fit for OfferUp, Grabio or HipSwap. Plus it looks like OfferUp only does posting from iOS for now. CL notwithstanding, seems like a lack of ubiquity is a show-stopper for adoption.

[kirillzubovsky]

I'd have to disagree. I think capturing iPhone-iphone sales could be huge. Of course, to do that, they need to enable payment.