You can see who upvoted and downvoted a post by viewing it in friendica.
rglullis @ rglullis @communick.news Posts 39Comments 1,814Joined 2 yr. ago

rglullis @ rglullis @communick.news
Posts
39
Comments
1,814
Joined
2 yr. ago
Replace "hashing" with "encrypted" (perhaps just using a symmetric key that the admin sets up) and then it gets impossible to know for any outsiders who is the real user behind the vote.
I for one just wish people understood once and for all that anything you do on social media is public.
If you are not comfortable backing up your opinion or action, then don't do it.