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 at school, he was telling me about that his father makes use of Bitcoin so I became interested so he told me more about it and invited me to his house to meet is father. Now I make use of Bitcoin myself.