there are many ways to spread about crypto currencies, actually without spreading it, they will know from our finacial changes as bitcoiners themselves, and they will start to be interested in crypto currencies which can indeed change lives in financial terms
The best thing to do to spread the word of bitcoin is by promoting it in social medias like Facebook, Twitter and Instagram because there are a lot of people on this sites. Maybe they will like to support this coins since it is very attractive to the people who always seeks for opportunities.