Personally, I like to think about how a post benefits the Hive ecosystem... is it likely to drive traffic to Hive - could new people find the blockchain through this post and then want to get involved because there are other valuable posts here?
I know that Hive can be lots of things to lots of people... and can be useful for lots of different groups on the internet - but I'm not always sure what Hive should be known for. We think of social media as immediate information, Reddit good for help solve problems or answer questions, etc etc. I personally use Hive to catch up on what the friends I've made here are up to, but I do try to vote content I think would drive traffic here too.