Which online rating services work best?

Which online rating services work best?
Hiring the right plumber, painter, or handyman can be hit or miss.

Angie's List and other online rating services say they can help you find the best company with the help of millions of prior customers who write reviews. Consumer Reports' money experts checked how the rating services work and whether you can rely on them.

With Angie's List, be wary of jumping on companies at the top of search results. Consumer Reports found that businesses with "A" or "B" ratings that also pay for advertising rise to the top of default search results. It's a big advantage.

Consumer Reports Money Adviser also checked out other rating services, including Yelp and Google Plus Local. Google Plus Local didn't respond when asked how it verifies that its reviews are from real customers.

Yelp told Consumer Reports that they have a way to identify and delete bogus reviews but admitted that the system has not been objectively tested. Yelp also allows businesses to buy their way to the top of the pack in search results. But unlike Angie's List, Yelp clearly labels the ad.

Consumer Reports found that ratings for the same business can vary significantly from site to site. But if you can't get a recommendation from someone you know, it may be worth it to look up a business on several sites.