this post was submitted on 31 Mar 2021
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Privacy
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This is one of these "true, but" kind of things. Of course in a federated network servers need to communicate with each other and that "leaks" meta-data to them. Maybe XMPP could be optimized a bit more to share less metadata (but it already shares less then Matrix), but in the end there is no way to totally avoid that if you want to enable federation.
IMHO I think the privacy benefits outweigh the downsides, because in XMPP each server only has a limited subset of the metadata and thus is it much harder to do AI driven data-mining on it.
Thank you for the insights, do you know which data that is in particular? For federation I would think 1) who you're speaking to (both servers?), 2) on which server they are, 3) how long, how often, etc. Is that about right?
Yes, and all of that lives inside TLS, so only the server admins on both ends would see it.