The centerpiece of it all is My.BarackObama.com, where supporters can join local groups, create events, sign up for updates and set up personal fund-raising pages. “If we did not have online organizing tools, it would be much harder to be where we are now,” Mr. Hughes said.
Mr. Obama, now the presumptive Democratic nominee, credits the Internet’s social networking tools with a “big part” of his primary season success.

