Yelp is tanking because it is putting profits before customers.

Case in point: let's say you're looking for a restaurant in a certain area, maybe in San Francisco? So you zoom into that area and do a search: find "x" in the map.

So what do they do? They zoom out (sometimes, far out) to include some advertisers.

Rule #1 if you have a customer-facing product: if you give the users choice, then respect that choice! Always respect the user. Always.