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LOS ANGELES — Rapper Ludacris has a fun assignment on ABC's Rising Star. Besides being a judge who comments on whether young singers should make the cut, he's also the go-to guy to answer viewer tweets during the commercials.

Rising Star, an American Idol-like talent competition, has its series finale Sunday at 9 p.m. with the final four contestants. The deciding votes will come from the public, via a smartphone app (free; Apple, Android).

The celebrity judges are there for mostly entertainment value — their votes have only accounted for 1% to 7% of the final tally.

Ludacris, with his 9.6 million Twitter followers, was a natural choice to answer fan questions as the show's official Tweeter. (Fellow judge Kesha has 3.6 million followers; country singer Brad Paisley has 2.6 million. Host Josh Groban has 765,000 followers.)

Culling through "thousands" of tweets during the show "is a hard job to do," says Ludacris. "The attention span of individuals these days is very short, so you've got to keep it going."

Fans ask him everything and anything. "Why I'm such a hard judge, why I voted the way I voted...others say they would have said exactly what I said. It's good to have that balance. You can't please everybody all the time, but as long as I'm honest and truthful to myself, I'm 100% fine."

He answers about 7-8 tweets during each commercial break.

Beyond plugging the Rising Star app ("your vote really counts," he says), his app of choice for life in Los Angeles is the navigation app Waze. "It's the best way to get through traffic. I use it on a daily basis." Other go-to apps: Weather and Word with Friends.

Follow Jefferson Graham on Twitter.

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