Still not sure that you need to get involved in the new social network Pinterest that allows users to "pin" images from the web on a web page for others to look at? Well, why you we're hesitating, Pinterest became the #3 social network in the US; ahead of LinkedIn and Google+, and behind only to Facebook and Twitter.
Pinterest's traffic jumped almost 50% from February to January 2012 with unique visitors increasing from 11 million to 17.8 million, according to Experian. Users are still most engaged on Facebook, spending an average of 405 minutes per month there, but they're also spending 89 minutes per month on Pinterest.
All that you really need to know about Pinterest is in this chart: