this post was submitted on 17 Nov 2023
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How does ActivityPub differ from what BlueSky is using? (AT) (lemmy.ca)
submitted 1 year ago by [email protected] to c/[email protected]
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I don't quite understand a lot of the details on how the implementations work.

In what ways is AT better or worse than ActivityPub? Are there different versions of ActivityPub? Are there improvements coming to either to make them better (or compatible)?

My current understanding is

  • AT makes it easier to move accounts (according to them), but AT is controlled and maintained by BlueSky, and they are a for-profit company that can mess with the protocol in the future, which goes against the central idea of decentralized social media

What other cool technical details are there?

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[–] [email protected] 27 points 1 year ago

On ActivityPub, your homeserver is responsible for pushing your publications out and pulling your followed accounts publications in. All implementations need to work both ways.
In AT your homeserver (PDS) pushes your publications out to a service provider (BGS), and you need to subscribe to this BGS to get publications in. Content moderation is done on the BGS layer, so harmful content is not deleted, only hidden. This is because the founder is a free speech extremist. As BGS collect posts and create timelines, it's possible for them to make algorithmic timelines, insert ads and so on.
Because BGS are more resource intensive, fewer people will run them, when they exist, and the network will have a high degree of centralization.