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Fediverse
There are two proposed solutions I have seen. I do not claim that this is exhaustive, just only limited to the proposals that I have stumbled across.
FASP - Fediverse Auxiliary Service Provider
The idea that mastodon has is to have a third-party service that does something like generate a link preview once and then share that to fediverse instances that need it. They have a whole spec they wrote up about these kinds of services that can be run to help out fediverse instances with different things like this, search, or discoverability. They call these FASPs - the repo with the spec is here.
I don’t yet know of any FASP that is live and running, so it is kind of a paper spec at the moment. I don’t do too much on the microblogging side of the fediverse though, so I very well could be wrong.
Federate link metadata and the post at the same time
This comes from an issue on PieFed’s repo. It is basically just an idea at this point, but it is a pretty basic one; have the originating instance fetch the link preview information and simply federate it out alongside the post itself.
