This is exactly what I am looking for. I am interested also in how other federated applications do it. I had a look at Pixelfed’s documentation, but they don’t seem to have an API for that… Do you know anything about other services?

This is good, thank you! How about Pixelfed, Pleroma, Misskey, kbin?

This is very helpful. Unfortunately the source code is not available… How did you find this service? Maybe you can point me to some other resource

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This is super useful! Thank you!

What do you mean? I can’t really picture myself this functionality