this post was submitted on 24 Jul 2026
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Tesseract is a web client for Lemmy that was found to be secretly and arbitrarily blocking users, communities and even entire instances. You can see if you're one of the kool kidz by running

curl -s https://tesseract.dubvee.org/tesseract/api/system/policy | base64 -d | gunzip > policy.json

and grepping your name / instance. Further details can be found in this post.

The poem above is adapted from Bertolt Brecht's The Burning of the Books, which can be read here. If you would rather read it in the original German, go here.

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[–] emergencyfood@sh.itjust.works 25 points 4 days ago (9 children)

Get yar medals here!

For the lucky ones indirectly blocked by Tesseract (instance ban / regex):

For the elite few who pissed them off enough to be banned by full name:

[–] davel@lemmy.ml 5 points 4 days ago* (last edited 4 days ago) (3 children)

Most of the regex bans are for those with user accounts on multiple instances under the same name. Extreme example: https://lemmy.ml/search?type=Users&q=cm0002

JSON isn’t especially greppable, which is why I often pipe them through gron.

[–] gary_host_laptop@lemmy.ml 2 points 4 days ago (1 children)

so essentially the only real blocks are the ones in the user list?

[–] davel@lemmy.ml 5 points 4 days ago* (last edited 4 days ago)

Both lists are blocklists, it’s just that one is processed as literal matches and the other as regular expression matches.

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