The concept alone is really bad. Nobody shares that much info on Facebook...Its not like every person that enjoys bike riding has "Liked" it or shared it on their Facebook..Not forgetting you can only have 4000 friends. And im not up for receiving random messages from friends of friends of friends inviting me to do stuff. The chances of you finding good candidates for any random activity (or search string) amongst your friends are close to NONE!
I think Facebook as a social network has the ability to do a lot but at the same time they are TOO MUCH of a social network, they focus so much on that till they can't visualize or conceptualize ANYTHING outside of social networking.... People should consider selling all their FB stock the next time it rises above $30 because their mobile ad business model is also quite pathetic....They are mistaking the mobile platform to be somewhat the same as the desktop, when its not...
On the other hand, Mu-Office is coming soon, so you're better off investing in that. Contact me on shaun@n-sho.com to stay updated! :D