Roger Arrieta—founder of the website Mark Cuban Save the Dodgers--started out by giving out stickers at Dodger games.
Next thing, he was on Yahoo News, and his site had almost three thousand Facebook followers.
Arrieta also used social media to organize a rally Saturday outside Dodger Stadium.
Media trucks and police flanked dozens of protestors at the corner of Elysian Way and Sunset Boulevard.
Shouting "Don't Go in There" and waving placards, they greeted fans on their way to Dodger Stadium, calling for an end to Frank McCourt's ownership of the baseball team.
Be sure to listen to the accompanying video we taped with Arrieta on Saturday at the rally.
Arrieta said he plans to organize another rally soon through social media.