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I guess most people will get to know bitcoins when governments start talk about it; yeah that is kind of situation in my country at least. Where people are lagging with latest technology, government policies make people to know what are happening in technological world.
if the government has discussed BTC, it means that the national media, both printed and electronic, will definitely highlight it. of course this will increasingly reach many people, and more and more people will know about cryptocurrency.
the good news, if the government supports cryptocurrency trading it will have a positive impact, on the contrary if there is a related ban it will usually cause a decline, especially if the news is issued by an influential country.