It’s not exactly news that Facebook continues its epic reign among social media sites – but it’s still surprising just how much it dominates. According to data cobbled together in a new infographic from San Francisco law firm Morrison & Foerster’s Socially Aware Blog, each month, visitors spend an average of 6.75 hours on Facebook. At first gloss, that may not sound like much, but that’s almost double the amount of time users spend with Tumblr, Pinterest, Twitter, LinkedIn and Google+ – combined.

Beyond chipping away at work day productivity, Facebook is hugely popular as a multi-screen activity. Among TV viewers, 61% report cruising the Web while watching the tube and 29% report going on Facebook while watching TV. If you want more juicy aggregated data about how Americans are using the social web, see the infographic: