[keenahn]

Interesting idea, and one I've seen before, but there's little incentive to contribute to this system. Reminds me of gasbuddy. In order for this to be crowdsourced, there would have to be an incentive to input quality data (see http://www.factual.com/ a local data API that gives you credits for uploading quality data).

A better system might be to scrape foursquare, twitter, facebook checkins, and just measure the ratios. It would be more automatic (no behavior change required), but would also be skewed (say, for example, women tweet more than men do).

[Shane1]

Very true. Providing incentive for people to contribute here is key. We're still brainstorming ideas and are looking for suggestions.

The reason we decided against scraping these other sites is that few people actually check-in. In a full bar, it'd be optimistic for >5 people to check in. This makes ratios very inaccurate. There actually is a site out there based on Foursquare check-ins and they suffer from this problem.