Dan Gillmor, who left the San Jose Mercury News a year ago to start the Bayosphere.com web site as a way to encourage “citizen journalism,” is now planning to move on to a new foundation he has started called the Center for Citizen Media. “Although citizen media, broadly defined, was taking the world by storm, the experiment with Bayosphere didn’t turn out the way I had hoped,” Gillmor wrote in a letter posted this morning. “Many fewer citizens participated, they were less interested in collaborating with one another, and the response to our initiatives was underwhelming. I would do things differently if I was starting over.”