Librarians should think of Yelp (yelp.com) as a kind of giant suggestion box hanging on the wall of the Internet. This web-based review service describes itself as "an online urban city guide that helps people find cool places to eat, shop, drink, relax and play, based on the informed opinions of a vibrant and active community of locals in the know." But it is not just an urban city guide anymore, and it is certainly not just for businesses, if the growing "Public Services & Government" category is any indication. Libraries--urban, suburban, and rural--are right there in the mix. In this article, the author describes a number of ways librarians can effectively use Yelp.