This is what I've been actively doing for years now. In the business realm it's commonly referred to as networking. It's easier to start business relationships that way - give it a business label. But the concept is the same - build relationship with others.
I came across this great video from a hospital that show's a glimpse as to what is going on inside someone's heart and mind. Watch it - and then think about those moments when you are at a ballgame, work, or church. Picture the tags next to people of all the things that could be going on. There's some common bonds there. Reach out. Have conversation. Don't be afraid to let down your own guard to show your tag. The world is made stronger through passion for others and life.