I started using the freemium (free for most stuff, paid for the high-end stuff) product SumoMe on this website a few weeks ago. I have already noticed increased traffic, increased social shares, and people signing up for my new e-mail newsletter that I am working on.
Examples: the share bar on the right and bottom of this page, the popup newsletter signup box. All powered by SumoMe, and I am only using the free tools.
It takes about 1 minute to install, so I have to say, quite the time-valuable website tool. You can give it a try here: http://sumome.com/
My takeaway: if I can connect with more teachers interested in improving their craft, I am on board!
If you have any questions about the tool, let me know, and I'll do my best to advise.