I'm not gregarious by nature, I value my solitude too much, and that takes it's toll on friendships. But if I wanted to put forth the effort to turn that around, I would do it through their stomachs. Who doesn't like to eat? And if I wasn't interested in cooking (which I already am!), I'd GET interested, and invite people over, one right after the other to try out new recipes. I guarantee, if you did this, you'd have more friends than you'd know what to do with!