As the name states, this is the site for you to talk about stuff, but mostly about local businesses around the world (but mostly in America). If you have enjoyed eating at a restaurant, then write about it! if you endured some horrible service at the supermarket, then whine about it! Users can post reviews while the business owners can comment back as well. They can also post messages, offers and events on their profiles. Yelp is one of the most popular review sites out there - having over 15 million reviews! I think it is one of the better ones.