When Paul Adams, a senior user experience researcher at Google, announced on Monday he was joining Facebook, it probably came as no surprise to those who have viewed his Slideshare presentation (below) more than 400,000 times.

The presentation was a foreshadowing of Facebook’s Groups and outlines the way forward for online communities to better reflect the realities of life offline.

It’s a looooooooong presentation but it’s a quick read. ¬†Does that makes sense? If you are at all interested in getting a firmer grasp on social media and drilling down into why Facebook Groups make sense, this is well worth your time.