I think best thing to do would be get them to use, rather than just telling people about it .Tipping is a wonderful way, but most of the people tip within the reddit bitcoin community itself, which already has enough information about it .

Try to dispel some of the negative rep BTC has in general. Whenever I try to bring up bitcoin, I'm always hearing the same "I heard on the news that bitcoin is used for drugs and money laundering" and "Bitcoin is the currency for criminals"As a community we need to work together to fight against this negative rep