well angie's list went public and are profitable so I consider them the profitable successor. I don't use either for anything though and I agree there's space to improve over Yelp. The trick is to monetize correctly, which Yelp has failed at miserably.
Angie's List has lost $36 million so far this year, I wouldn't consider that profitable lol.
ANGI Income Statement | Angie's List, Inc. Stock - Yahoo! Finance
Wouldn't these companies be competing with Google places and local search stuff? Seems like a bad business to be in imo