It is more effective to only upvote posts under 7 days old, although you can upvote older posts. They will not pay curator rewards to you or the author. Don't upvote too many posts a day, around 15 to 20, or you will lose all your voting power and it takes 3 days to regrow again. Making comments provides more opportunities to receive more upvotes, sometimes comments receive more upvotes than the main post.
I am curious if anyone can validate this?
