Take a look at the Social Networking Guide and watch the Social Networking Screencast.
Explore some of the ELT groups and communities on Google+, Facebook, Instagram, Diigo, LinkedIn, and elsewhere . Add additional communities and or accounts to the TILL Group Notes.
Join ones of interest, bookmark them with Diigo, and/or create a blog post about any interesting discoveries.
If you’re feeling ambitious, join twitter, find some people to follow and send out your first tweet.
Last Week Flashback: Feed Me! with Feedly.com
(slightly out-of-date screencast here)