I think the ability to upvote ones one forum post should be eliminated if possible. I never put the first upvote on any of my posts but whenever I am reviewing a thread and I see that someone liked one of my posts I feel a weird compulsion to bring it to 2 likes just so nobody thinks the first like was mine. Like, I assume that anyone who sees one of my posts with a single like will assume I liked my own post so I bring it to 2 just to show "yes actually someone did like my post, even if you assume one was from me if it is at 2 you know I was liked by someone else at least once. Validation!"
So, if you ever see a post of mine with 1 like it was not me but if there are multiple likes chances are high (though less than 100%) that at least one was mine.
This would not really change much so if it would be a pain feel free to leave it but if it doesn't require much coding effort it would be worth it to help with my psychological conditioning to leave a second like on all my liked posts. Thanks.