466, but I use it as a networking tool and to keep track of social events in my area (San Fran). Of those who I actually see post items or who can see what I post, I'd guess maybe 150, of which at least 100 are skydivers.
Funny that someone I've never met from the skydiving world I'll have "60 friends in common" with, but someone I've known all of my life I'll have 15 or so.