Louis Vuitton, Nike and CoverGirl are the experts when it comes to famous faces. Are they the exception? Maybe not, but it seems that this year, especially, too many brands got in on the act. At the jump, Tor Myhren, Grey Worldwide’s CCO, talks about how social media, and the fact that celebrities have become legitimate media channels with millions of Twitter followers, Facebook fans, and video appearances is helping drive this. And sometimes polarizing is good (e.g., Lincoln and Matthew).