This Saturday, the network will launch ABC Social: Episode Commentary on ABC.com. The new tool allows Web viewers to comment on shows in a window to the left of the site’s video player. Users can log in to this feature using their Facebook I.D.s, and they can instantly share personal commentary with their Facebook friends. ABC is using this week’s premiere of the sci-fi remake V to kick off ABC Social -- as the show’s debut episode will be the first to incorporate the functionality starting this weekend. To make ABC Social more compelling -- and to stoke the passion of sci-fi fans -- the site will include commentary from V executive producers Scott Peters and Steve Pearlman. ABC plans to include such "insider" commentary alongside other shows down the road, potentially including commentary from actors, network executives and show staffers, journalists and even bloggers. - mediaeater