Just a quick note: Yelp announced a new feature which makes social media more relevant to your offline (local) business than ever before. The new feature lets users share Yelp reviews with Facebook and Twitter.
It's easy to imagine that many Yelp users were already doing this but with a direct integration count on it being a much more prominent activity now. Upon completing a review, users are presented with an option to choose sharing the information they just posted.
Quick look at Yelp growth year-over-year: