facebook is the only social media to suffer a decline last year, youtube, twitter, google & others all grew....Media titan Rupert Murdoch has even issued a dire warning, writing on Twitter this month: "Look out Facebook! Hours spent participating per member dropping seriously. First really bad sign as seen by crappy MySpace years ago." (Murdoch's News Corp. (NWS -0.40%) bought MySpace for $580 million, only to sell it several years later for a reported $35 million.)w.