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I believe user reviews to work for local audience targeting. You can certainly add user reviews and ratings with Yelp and various others. I know a few engineers who use SENUKE to help manage creating the accounts and submitting reviews. However, I would not recommend this as a stratagem to rely on for strong link signals. Remember last year's algorithms was targeting too much of the same link schemes to rank. I would include this in your SEO but balance it with a full content algorithm to help your brand target your customer's pain points. Sharing and syndicating this content will help create the social signals, which will in return have Google trust your full link-foot-print! Also if you do this, try and get on a 0 to 90 schedule and only do it once or twice!