Embed Notice

@silverpill I think you're covering a lot of territory. I'm in agreement about some of these:

- Data portability. We started a task force for this in the Social CG. Definitely important!
- End-to-end encryption. It's time to get on this; I don't think building on top of an incompatible stack is the way to go, though. https://evanp.me/2023/05/19/end-to-end-encrypted-messages-over-activitypub/ is much more in line with existing AP work.
- Quote Announce. This comes down to recommending `content` in the `Announce` activity.

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