My question is quite simple:
When is one supposed to upvote questions?
E.g. am I upvoting, because...
- I personally find the question interesting.
- I find the question helpful or I have gained new insight from it.
- I feel the question is well-posed and the questioner has made some effort to provide motivation, his/her own thoughts, etc.
- I feel that many people might potentially benefit from this question.
- of something else?
Looking at the questions with most upvotes, I would say the first option is common practice. But - as fun as Batman shaped graphs may be - upvotes don't really seem to reflect the "significance" (which would perhaps be measured by option 2) of the question.
So what was the intention in the upvoting system for questions? What practice would be recommended? Why couldn't I find a guideline on "when to upvote" in the FAQs?
Some clarification would be great!