Every industry these days is trying to figure out how to employ social media, but the auto category is being especially scrutinized. The segment is known for its glitzy TV ads and deep pockets, but social media is a field where money will only drive you so far. The big gains seem to come from out-thinking opponents, not outspending them. So how are the big automakers doing in this new arena? As this infographic shows, there have been some triumphs, some missteps, and a lot of learning.