Just trying to understand things (maybe someone can help).
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Summary of long post:
1. The Friendica, Hubzilla, Streams, and Socialhome, approach is:
* A group of people in the room having a discussion in their own languages. Only people who understand more than one language can understand other people.
2. The Threads approach is:
* They provide their own translator who interprets between two languages.
3. The Bridge approach is:
* There are two translators.
* 1st Translator: knows Filipino Sign Language (FSL) and English.
* 2nd Translator: knows Japanese Sign Language (JSL) and English.
a. A Filipino communicated in FSL.
b. Translator A translates FSL into English.
c. Translator B translates English into JSL.
There is a bridge between the FSL and JSL speakers.
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How I understand it:
In #Friendica #Hubzilla #Streams and #Socialhome, if users comment on your post from #diaspora and #ActivityPub, users without the other protocol will not see those replies. Only accounts with both protocols can see the comments from both networks.
There is no “opt-in” or “opt-out”, it just is.
I'm no expert in this, but if I understood it correctly, the reason is the mentioned software are not acting as a bridge or translation between protocols. A comment/post from diaspora remains as diaspora, it is not remade into ActivityPub; and vice versa.
In a bridge, there is a translation going on. An ActivityPub comment/post is remade into a Bluesky comment/post and vice versa.
Again, IF I understood it correctly.
#Threads is testing their AP feature, and as it currently stands, a #Fediverse user commenting on a Threads post, that comment is only visible to Threads accounts with AP enabled. At the same time, Threads comments are only visible in the Fediverse if that Threads account who made the comment have AP enabled.
(Based on limited testing when I left comments on AP enabled Threads posts.)
In Threads approach, it appears that they do some translation between Threads-protocol and AP. Or, maybe, they do some filter, if an account enables AP, a Threads-proto post/comment is encapsulated as an AP so AP-supporting sites can recognise it.
Which still is different from a bridge.