How PowerVoice Is Cashing In on Paid TweetsPowerVoice enables social media personalities to promote brands for bucks.

A former contestant on ABC's The Bachelorette, Reid Rosenthal uses his insight to live-tweet humorous commentary about the current season of The Bachelor to his 15,000 Twitter followers. As he does so, he sometimes slips in an endorsement for Netflix or the Jewish dating site JDate. That's because Rosenthal is one of a few thousand social media influencers paid by PowerVoice to plug products and services. The Birmingham, Mich.-based company, which launched in January, hopes to cash in on the intersection of social media and e-commerce.

ForPowerVoiceto be effective, the influencers have to remain honest with their audience, tweeting about brands and products that make sense--not to mention remaining in compliance with Federal Trade Commission guidelines, which require disclosure of paid endorsements. Rosenthal, for one, won't mess with his readers' trust. So far he hasn't lost any fans by adding "#ad" to PowerVoice tweets, but, he says, "I can imagine that if you just spam you'll start losing followers."