Leonardo DiCaprio and Tobey Maguire lead a cast of stars in a new public service announcement urging young voters to use social media to express the issues most important to them in the upcoming election.

Zac Efron, Selena Gomez, Ellen DeGeneres, Jonah Hill and Joseph Gordon Levitt also appear in the Vote 4 Stuff video unveiled Monday, joining other stars in a call to voters to post tweets, photos and short videos about concerns they feel deserve presidential attention.

"This is one of the most important elections of our lifetime," said DiCaprio, whose production company, Appian Way, is a producer of Vote 4 Stuff. "We are using the power of social media throughout the Vote 4 Stuff campaign to incite bipartisan conversation around real issues, encourage registration and voting in November."

Sandy Cohen, Associated Press