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 it from my classmates a few months ago. In addition, my classmates teach me how to get bitcoin in some easy ways and they tell all things about bitcoin. I also conduct a study about bitcoin to know it fully. Lastly, Im glad that I know what bitcoin is because I can make money by using bitcoin.