Coffee houses and social media

As a follow-on to a post I made a few years ago about essays on caffeine, here's a fun related piece in the NYT about coffee houses as the social media of the 1600s. Samuel Pepys, stop wasting so much time on Facebook? And there's the ubiquitous reference to the use of social media in the classroom, something I wish I could get started with my students but so far haven't found the right way to do it.