Anecdote not data, but out of 96 emails in my inbox, only one of them is even remotely social (if you count a family member asking for PC tech support as social)...
well then I suppose you have a facebook and have blocked all those annoying email from facebook warning you about what's happening on facebook which is a dead giveaway that facebook understand that email is where the action is/was/will be.
Try surveying an inbox of those who do not use facebook. Chances are you'll get quite a different picture.
Try surveying an inbox of those who do not use facebook. Chances are you'll get quite a different picture.
You can also have a look at those:
http://www.theatlantic.com/technology/archive/2014/08/why-em...
http://blog.frontapp.com/email-will-last-forever (seems to be down at the moment, try the wayback machine: http://web.archive.org/web/20150331054046/http://blog.fronta... )