The cynic in me is laughing at this right now. You've got a VC-pumped mostly-failed fad startup with highly questionable value to its deal-providers (Groupon) potentially buying a known bad actor (Yelp) in an effort to stay alive by merging operations into something that's likely to be a combination of awfulness. The likelihood of basically-extortion and strong-arming of small businesses is going to be through the roof if this happens.
