I have a simple rule - if someone makes me feel something positive, I tell them. It started when I was hanging out with friends downtown and a girl ran up to compliment my shoes, then immediately walked off. It felt great, especially because she left before I could wonder what her angle was

So now, I make a point to speak up. If someone says something funny I overhear, I tell them I thought so. If I think they had a cool shirt, I say so. Then I just go back to my own business