The Nielsen Social Media Report 2012 was released this week. Facebook topped the list of most-visited social networks, as expected, but time spent on Pinterest’s website increased by more than 1000% year-over-year. Google+, Tumblr, and Twitter are also growing at a steady rate. It will be intereting to see if the newly relaunched 'Myspace' will be a big mover and shaker during 2013.