Care2 marks milestones, offers insight into moving supporters to action.

By Margaret Battistelli Gardner

"When we started the PetitionSite over 12 years ago, it was a grand experiment to empower individuals to start online petitions and make a difference," Care2 Founder and President Randy Paynter said in a press release. "Critics laughed and said it wouldn't work.

"Today, nearly 20 million Care2 members have demonstrated the incredible collective power each one of us has to change the world," he added.