I suggest to friends to create an account here in bitcointalk, because in most bitcointalk forums they know about bitcoin. And then if he starts asking, I'll try to explain what I know.
Getting people aware of this forum must be one of the effective way of spreading bitcoin knowledge. Because no other resources could be as versatile as bitcointalk.
By introducing this forum to new people, I believe half of the work would have been completed by the time of we are introducing this forum. Because when people entering here might be getting all the possibilities of learning about bitcoin along with opportunities to earn it. When they are practically experiencing bitcoin, the chances for gaining knowledge in more quick time will be possible.