Very few, at the moment - I only started thinking about it a few days ago when I saw the "AfricaHackTrip" on MeetUp.com. I would be unable to join them on that trip, but it's got me thinking about what else I might be able to contribute. Do you have any ideas?
Well, most damage(to hacker-mindedness) is done in high schools and universities, that's a place one can start with. I'm thinking our hackspaces need to have good libraries so a book donation inititave would help.