Will Obama Be Snagged By His Own Social Networking Site? By JONATHAN TILOVE Barack Obama greets supporters at the University of Maryland's Comcast Center. The senator's social networking site, considered the best in the presidential campaign, is a source of both strength and peril. (File photo by Tyrone Turner) WASHINGTON — Barack Obama's Web site is by most accounts the best in his business. It is critical to the campaign's record-breaking fundraising, nimble grass-roots organizing and image as a broad-based, participatory force for change. But the very virtues of this wiki-world carry peril.For the first time in...