We had a really interesting discussion yesterday about voting on Lemmy/PieFed/Mbin and whether they should be private or not, whether they are already public and to what degree, if another way was possible. There was a widely held belief that votes should be private yet it was repeatedly pointed out that a quick visit to an Mbin instance was enough to see all the upvotes and that Lemmy admins already have a quick and easy UI for upvotes and downvotes (with predictable results ). Some thought that using ActivityPub automatically means any privacy is impossible (spoiler: it doesn't).
As a response, I’m trying this out: PieFed accounts now have two profiles within them - one used for posting content and another (with no name, profile photo or bio, etc) for voting. PieFed federates content using the main profile most of the time but when sending votes to Mbin and Lemmy it uses the anonymous profile. The anonymous profile cannot be associated with its controlling account by anyone other than your PieFed instance admin(s). There is one and only one anonymous profile per account so it will still be possible to analyze voting patterns for abuse or manipulation.
ActivityPub geeks: the anonymous profile is a separate Actor with a different url. The Activity for the vote has its “actor” field set to the anonymous Actor url instead of the main Actor. PieFed provides all the usual url endpoints, WebFinger, etc for both actors but only provides user-provided PII for the main one.
That’s all it is. Pretty simple, really.
To enable the anonymous profile, go to https://piefed.social/user/settings and tick the ‘Vote privately’ checkbox. If you make a new account now it will have this ticked already.
This will be a bit controversial, for some. I’ll be listening to your feedback and here to answer any questions. Remember this is just an experiment which could be removed if it turns out to make things worse rather than better. I've done my best to think through the implications and side-effects but there could be things I missed. Let's see how it goes.
While not a perfect solution, this seems very smart. It’s a great mitigation tactic to try to keep user’s privacy intact.
Seems to me there’s still routes to deanonymization:
Piefed is smaller than lemmy, right? So if only one targeted posting account is voting somewhat consistently in posts where few piefed users vote/post/view, you got your guy.
Obviously this is way harder than just viewing votes. Not sure who would go to the trouble. But a deanonymization attack is still possible. Perhaps rotate the ids of the voting accounts periodically?
It will never be foolproof for users coming from smaller instances, even with changing IDs. If you see a downvote coming from PieFed.social you already have it narrowed down to not too many users, and the rest you can probably infer based on who contributes to a given discussion.
Still, I think it's enough to be effective most of the time.
Yea, I agree. It’s good enough. Sorry, I didn’t mean to sound like it was a bad solution, it’s just not perfect and people ought to be aware of limitations.
I used a small instance in my example so the problem was easier to understand, but a motivated person could target someone on a large instance, too, so long as that person tended to vote in the posts they commented on.
Just for example (and I feel like I should mention, I have no bad feelings towards this guy), Flying Squid on lemmy.world posts all over the place, even on topics with few upvotes. If you pull all his posts, and all votes left in those posts from all users, I bet you could find one voter who stands out from the crowd. You just need to find the guy following him everywhere: himself.
I mean, if he tends to leave votes in topics he comments on, which I assume he does.
It would have to be a very targeted attack and that’s much better than the system lemmy uses right now. I’m remembering the mass tagger on Reddit, I thought that add on was pretty toxic sometimes.
Also, it just occurred to me, on Lemmy, when you post you start with one vote, your own. I can even remove this vote (and I’ll do it and start this post off with score 0). I wonder how this vote is handled internally? That would be an immediate flaw in this attempt to protect people’s privacy.
Yeah, I think your point is absolutely well made. And it's a good reason to, even if features like this are implemented widely, we shouldn't boast too much about voting being anonymous. It's just too difficult or impossible to make it bullet proof.
I don't think the automatic upvotes to your own posts count as real upvotes. At least they don't federate, so they shouldn't pose too much of a problem. I think they're just there to keep people from trying to upvote their own content.
It could be mitigated further by having a different Actor per community you engage in, but that is definitely a bigger change in how voting works currently, and might have issues detecting vote brigading.
Not familiar with how piefed handles it specifically but aren't posts/comments self-upvoted by default?
You could probably figure it out pretty easily just by looking at a user's posts, no?
(This is unless piefed makes it so the main actor up votes their own posts, and the anonymous actor upvotes others' posts, but then it would still be possible to do analysis on others' comments to get a pretty accurate guess)