I post regularly on Yelp and have used it to find new restaurants based on other Yelpers' reviews.

Some reviewers are better at it than others, though. What I look for is a good description of why the reviewer liked the place or why they didn't. Especially when it's the first review of a place, I'd rather see more information about it. When there's 30 other reviews, a reviewer can usually get away with less specifics and more commentary.

General comments such as, "This is a dive bar!" can be vaguely enlightening, but I need more: "This is a dive bar: there's no Guinness on tap!"