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.
Me, i first heard it inside our classroom. My friends are talking about what bitcoin is. During that time i didn't believe on it. but when they show it to me. i believed that bitcoin is real and really exist. Even i know that is real i didn't use it because the first thing that comes in my mind is the word "scam". Whenever I heard about money and transaction online i always think that its scam. But because of my curiosity about it. I tried it and i found out that if you will be careful of your money youll not be scam by other people.
yeah i also heard about bitcoin through my college friend few years ago the i start to use bitcoin and bitcoin is really a great currency for us and we can get good profit from bitcoin easily and a lot of people adopting bitcoin in good amount.