Hey folks!

I made a short post last night explaining why image uploads had been disabled. This was in the middle of the night for me, so I did not have time to go into a lot of detail, but I’m writing a more detailed post now to clear up where we are now and where we plan to go.

What’s the problem?

As shared by the lemmy.world team, over the past few days, some people have been spamming one of their communities with CSAM images. Lemmy has been attacked in various ways before, but this is clearly on a whole new level of depravity, as it’s first and foremost an attack on actual victims of child abuse, in addition to being an attack on the users and admins on Lemmy.

What’s the solution?

I am putting together a plan, both for the short term and for the longer term, to combat and prevent such content from ever reaching lemm.ee servers.

For the immediate future, I am taking the following steps:

1) Image uploads are completely disabled for all users

This is a drastic measure, and I am aware that it’s the opposite of what many of our users have been hoping, but at the moment, we simply don’t have the necessary tools to safely handle uploaded images.

2) All images which have federated in from other instances will be deleted from our servers, without any exception

At this point, we have millions of such images, and I am planning to just indiscriminately purge all of them. Posts from other instances will not be broken after the deletion, the deleted images will simply be loaded directly from other instances.

3) I will apply a small patch to the Lemmy backend running on lemm.ee to prevent images from other instances from being downloaded to our servers

Lemmy has always loaded some images directly from other servers, while saving other images locally to serve directly. I am eliminating the second option for the time being, forcing all images uploaded on external instances to always be loaded from those servers. This will somewhat increase the amount of servers which users will fetch images from when opening lemm.ee, which certainly has downsides, but I believe this is preferable to opening up our servers to potentially illegal content.

For the longer term, I have some further ideas:

4) Invite-based registrations

I believe that one of the best ways to effectively combat spam and malicious users is to implement an invite system on Lemmy. I have wanted to work on such a system ever since I first set up this instance, but real life and other things have been getting in the way, so I haven’t had a chance. However, with the current situation, I believe this feature is more important then ever, and I’m very hopeful I will be able to make time to work on it very soon.

My idea would be to grant our users a few invites, which would replenish every month if used. An invite will be required to sign up on lemm.ee after that point. The system will keep track of the invite hierarchy, and in extreme cases (such as spambot sign-ups), inviters may be held responsible for rule breaking users they have invited.

While this will certainly create a barrier of entry to signing up on lemm.ee, we are already one of the biggest instances, and I think at this point, such a barrier will do more good than harm.

5) Account requirements for specific activities

This is something that many admins and mods have been discussing for a while now, and I believe it would be an important feature for lemm.ee as well. Essentially, I would like to limit certain activities to users which meet specific requirements (maybe account age, amount of comments, etc). These activities might include things like image uploads, community creation, perhaps even private messages.

This could in theory limit creation of new accounts just to break rules (or laws).

6) Automated ML based NSFW scanning for all uploaded images

I think it makes sense to apply automatic scanning on all images before we save them on our servers, and if it’s flagged as NSFW, then we don’t accept the upload. While machine learning is not 100% accurate and will produce false positives, I believe this is a trade-off that we simply need to accept at this point. Not only will this help against any potential CSAM, it will also help us better enforce our “no pornography” rule.

This would potentially also allow us to resume caching images from other instances, which will improve both performance and privacy on lemm.ee.


With all of the above in place, I believe we will be able to re-enable image uploads with a much higher degree of safety. Of course, most of these ideas come with some significant downsides, but please keep in mind that users posting CSAM present an existential threat to Lemmy (in addition to just being absolutely morally disgusting and actively harmful to the victims of the abuse). If the choice is between having a Lemmy instance with some restrictions, or not having a Lemmy instance at all, then I think the restrictions are the better option.

I also would appreciate your patience in this matter, as all of the long term plans require additional development, and while this is currently a high priority issue for all Lemmy admins, we are all still volunteers and do not have the freedom to dedicate huge amounts of hours to working on new features.


As always, your feedback and thoughts are appreciated, so please feel free to leave a comment if you disagree with any of the plans or if you have any suggestions on how to improve them.

  • MrSebSin@lemm.ee
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    1 year ago

    I hope there is another option besides just deleting images indiscriminately. I run several comic strip communities and it would be a shame to lose all the posts and work I’ve put in.

    What about implementing Imgur or something similar, assuming they scan for CSAM on their end. For example I often use the Lemmy iOS app and I noticed that all my image uploads using the app are through Imgur.

    • sunaurus@lemm.eeOPM
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      1 year ago

      @TWeaK is correct, I am only deleting our copies of images which are already hosted on other instances.

      As for imgur (or any other external image host), such images have always worked on lemm.ee. For example, this is hosted on imgur:

      pac-man

      In addition to using external images in comments, you are also able to submit posts with imgur images, and they will get embedded directly into the Lemmy UI.

    • TWeaK@lemm.ee
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      1 year ago

      You wouldn’t lose the posts you’ve made, rather the posts you’ve made will be hosted from one instance, rather than all of them.

      You’re a lemm.ee user, if you upload to a lemm.ee community nothing will change.

      If you upload to another community, then normally you’re post would be uploaded to lemm.ee. This would then be federated, and users from other instances would load the same content, but it would be delivered by their own instance.

      The change refers to things beings hosted only in your host instance. Thus, a lemm.ee user may load content from a lemmy.world server more often. Normally, lemm.ee would copy the content to its own servers and direct its users to that, but now everything will go to the host instance.

      The only thing I’m not sure about is who is the host instance? My understanding is that the host instance is that which the user belongs to. Thus, if a lemm.ee user posts to a community in lemmy.world, techincally the federated host instance is still lemm.ee - it’s about the user, not the community. But with all this I’m not sure.

      • freamon@endlesstalk.org
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        1 year ago

        The only thing I’m not sure about is who is the host instance? My understanding is that the host instance is that which the user belongs to.

        That’s my understanding too - if you’re a lemm.ee user, and you want to upload to pics@lemmy.world, then when you post, you’re actually posting to lemm.ee/c/pics@lemmy.world. This rule change means that - for the moment - lemm.ee users can’t upload any images directly when making a post, irrespective of where the community is. They’d have to use an external host like imgur.