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 to may sister using while she is using her BTC account.
I ask her what is the use of bitcoin and she briefly give me an information regarding the use of BTC and importance of it.