I don't think the compliment "quite clever" undermines anyone. I was trying to be clear that my comment wasn't about finding someone better than Culver, but someone with a more successful product. I don't think anyone would argue that Convore are anywhere near as successful as Airbnb, Foursquare or even Kayak. I'm sure there's a lot to be learned from the failure of Pownce, but the rest of the field certainly seems to be a draw because of their apparent success.