Yes, Google+, because even though they don’t have the user impact of the other three, they get the press. So what about Tumblr? According to numbers from eMarketer, the graphically-oriented blogging site has a few more users than Google+ (15.9 million vs 15.2) so why aren’t we talking about them every week?
I’ll go you one better. Have you seen Pinterest? This photo cataloging site makes Tumblr look like War and Peace by text comparison. This hot, new social media site encourages you to “pin” photos of items into like categories. You can use mundane categories such as foods or fashions, but Pinterest would like you to be more cerebral. “Things on my bucket list,” “Motivation” and “Kid-spiration.”