I will give some bitcoin to my friends and relatives to promote the bitcoin so that the bitcoin price will rise.
That is very good idea. If we can get 10 new users for each forum member, then the user number will increase a lot.
It will still depend if they get interested to it or not. If they are really interested with it they will promote it even without a bribe or a reward. They will promote it because they trust it. They will tell people what is it and how to earn from it.