I think a better question is "What do you care about"?
The posts that are the best-received here are the ones that are brought in by people who are interested and passionate about their subject. But then, What does it mean to be well received?
Don't make posts to try and get people to like you or get other people's attention - do it because you like the subject and are passionate about it. If no one shares it? Unfortunate, but at the end of the day it's not about them, it's about you and your enjoyment of the subject.