Yelp

The Yelp website has transformed the directory space. The user reviews on Yelp help people around the world decide whether or not to visit restaurants, find a handy person, and more. The company has gotten a lot of flack over the years about their pressure sales tactics and the potential "goosing" of user reviews, but the underlying service is still useful.

140 New Montgomery Street, San Francisco, CA

www.yelp.com