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 was heard first about bitcoin last year my former classmates talking about it but its kinda weird for me because you can have money by just posting in a campaign stuff and I just ignored it. It's a scam for me but then when my close friend indroduce and explain whats bitcoin is then I understand it I decided to join fir extra income since I'm a student only.