How to express altruism through your work in computer science?

As an almost graduated student, I seriously have to start what to do with my knowledge. I did a master in computer science for a simple reason : I wanted to know how to command the most powerful (electronic) tool that exists nowadays.

Almost done but I'm still worried about what I can do. I am not talking about doing volunteers actions, I am already doing it and it seems obvious that I need a revenue.

Here are some possible large subjects :

- Education : we swim in electronics everyday and still a lot of persons don't know how it works or sometimes use it.

- Communication : altruism lies in collaboration, we need powerful tools to communicate.

I'll be glad to hear yours, your examples.