There are people,who have no clue at all,what Bitcoin is.But,I think everybody,who is in the internet marketing knows a lot about Bitcoin or at least has heard about Bitcoin.Almost all the earning sites(Ptc,Revshare,Gpt sites)do have a Bitcoin payment option and there are many people being active on those sites,so there is another way to raise the curiosity of the people about  Bitcoin and this way the people want to find out more about Cryptocurrencies.