Math.SE got me through my maths major. Now I'm an Economist, and I want Economics.SE to grow. I also want to build my reputation on WebApps.SE by answering questions about Google Drive, and I'd like to learn more about Google Sheets there.
I appreciate how StackExchange sites have decent norms for how one should interact on an online forum, coupled with vibrant meta-discussions. It is more pleasant and educational to spend time here compared to Facebook.