In my personal experience, I first heard of it 1 year ago in a online forum game, people sold gold for Bitcoins, around March, gave it no importance at first. Now im kinda utterly commited to it. Really an interest subject of study.
I first heard bitcoin at school, my classmate shared to us what bitcoin is, how it is working and how he earn.
And I heard about bitcoin from one of friend he was buying some food for himself and he was using bitcoin which was my first experience then
I ask him for myself that I also want to use digital currency and now I am also the user of bitcoin .