Well you've got (among others)
Peter F Hamilton - global warming, politics etc. (Mindstar Rising trilogy) or epic saga dealing with space-faring cultures and humanity facing the realisation that Death isn't the end (Night's Dawn trilogy), along with many others.
Neal Stephenson - Snow Crash, Diamond age etc., and his most recent (in the last month) Reamde looking at the successor to World of Warcraft
Richard Morgan - Altered Carbon (and the rest of the Takeshi Kovacs trilogy) is a stunning 'new' work, well recommended
China Mieville - Perdido Street Station and Scar in particular
Charlie Stross - Halting State is another one about a future with distributed 'augmented reality' games etc.
And not one of 'em talks about social networks etc.