As a country, we are obsessed with liking, sharing, tweeting, and pinning. Seriously obsessed. Nielsen has just published their Social Media Report for 2012 and the numbers are staggering.

According to Nielsen, Americans spent a total of 121.1 billion minutes on social media sites during the month of July. Make a few calculations and we find that over 230 millennia was spent on Facebook, Twitter, Pinterest, and other social networks in a four week span. That’s just incredible. Nielsen’s stats include sites like Blogger and Tumblr, so were really talking about social networking and blogging here – but still, it’s pretty unbelievable.

Year-over-year our total time on social media increased a whopping 32.7 billion minutes.

Nielsen also determined that our socia media obsession is moving more toward mobile. While 87.8 uniques accessed social media via mobile (web and apps combined) in July of 2011, 166.9 did so in July of 2012. When you look at who is doing the most social networking, Nielsen’s findings echo previous claims that say young women are the most active.

Facebook remained the top social network, followed by Blogger, Twitter, WordPress, and LinkedIn. Pinterest saw the biggest increase from 2011, with users spending 1.25 billion minutes via web, 120 million via app, and 720 million via mobile web.

You can check out Nielsen’s full social media report here.