Should you up-vote your own posts/comments?

I have already asked this on Aether itself, but the answers weren’t really clear.

After at first I haven’t up-voted my own contributions, later (after the first answer to my Aether question) I got to up-vote them. What do you think was the right way?

Just to confirm there is no clear answer for this. It’s something for the community to decide for the ethics of.