First time ever listening to this guy for me. It is surprising that he's so physically active, I always imagined him as a basement-living nerd. Also, I kinda dig Mark's mission to take online socializing to the next level, this is very interesting. Other than the way too obvious facebook-like product placement, I didn't really like his attitude towards corporate supremacy over the small prospering companies. The wording, such as "defense division". Would not want to work there.I also wonder if he'll be visiting Joe in the future - he was publicly invited to do so, but the talk was overall a little boring and a little too long.