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.
My first heard of it 1 year ago in my some friends. 1 years ago onday wait on my some friends then they tell me about bitcoin. At first that day i know bitcoin and i try to earn it. And now i love bitcoin because it's presently my dream.