I have resgistered on Stackoverflow serveral months ago, and have answered, commented, discussed a bunch of problems, issues on it. I think this is a really good website, for developers to impove themself in skills and knowledges.
It is such a good feeling when the point is increasing couple days once. But moreover, I was really excited all that working day because of a beginning of that day with this kind of message that someone gave to me. So we could easily see, happiness is just very simple.
Keep working, contributing, helping people and community, you will get happiness every single day you live.
Btw, just want you guys to meet my lovely friend :D His name is Pig (big cat image above), because of he eat a lot.