i use social media like facebook too to advertise bitcoin and i think it makes my friends to asked me about bitcoin. beside social media, when i gathered with my friends, i always speak about crypto currency especially what is happen with bitcoin and altcoin and sometimes there is a person or one group of people come and join with us and asked about what we talk. and after this, usually we are discussing together and i see there a good passion from them and sometimes after the next meeting, they decide to join with bitcoin because they are really curious with crypto currency.