We don't charge merchants money for listing specials, and we don't sell search results. If and when we let merchants advertise on foursquare, all ads will be cl

We don't charge merchants money for listing specials, and we don't sell search results. If and when we let merchants advertise on foursquare, all ads will be clearly marked as such. There are a couple of reasons we might have recommended that Chilli's. Have any of your foursquare friends checked in there? That's a pretty strong signal for us, so that might be why it's showing up so highly. If not, it might be that a lot of people check in to that Chilli's. That said, there's probably more we can do to detect chain restaurants and either boost them or bury them based on your personal likelihood of visiting chain restaurants. Unfortunately, all our ranking code currently works at the level of individual venues, so there's work for us yet on knowing that the venue is part of a chain and ranking accordingly.