If I've read it before and I consider it up vote worthy, then I upvote. If it's something I've read and I want save it for later, I also upvote it. If I didn'

If I've read it before and I consider it up vote worthy, then I upvote. If it's something I've read and I want save it for later, I also upvote it. If I didn't read it before and it's upvote worthy, then I upvote. If it's something I'd like to see discussed on HN, I upvote. Tldr: only if I've read it