Gartner again
Take this with the usual pinch of salt. People I talk to generally think that the social media hype has peaked and that companies are looking for other ways to "engage" customers. Anecdotal, small sample so not worth taking seriously unlike Gartner's extremely well-researched stuff, of course.
The Economist's Special Report on "post-PC" stuff is worth reading despite it being full of Gartner crystal-gazing.