I heard it back in 2011 where in there was a huge hype of mining Bitcoin using GPU's and there were numerous facebook groups where they posted they rigs and also had many tutorials for other to follow or even customize their rigs in order to work better.
I heard about bitcoin talk 1 month ago from my friend , he told me about how to work in bitcoin and share some video about bitcoin talk.
I also heard it from a friend of mine he was always busy on his pc doing something so one day I asked him what he was doing and he explained it to me.
So then I decided for my self to also start with Bitcoin and now I am here making use of it.
i think a friend or methods of mouth is the deployment bitcoin that pretty good if users bitcoin least tell one of their friends to join in bitcoin then it goes to a new user, i'm sure the mass adoption to be rapid and this will certainly provide a nice effect for bitcoin itself, the effect is like starting many merchants that will accept bitcoin because he sees a huge market potential in there,,