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What do you think the best way to opt-in or opt-out of memo subscriptions would be?

Opt-in. This way you won't bother anyone.

How should they opt-in?

By having a button or something...like the subscribe button from youtube.

Follow = opt in
Unfollow = opt out

Mention this in all your posts, this way if someone follows you, its implied that they actually 'read' your posts, right?

If not then they are spamming the network anyway with pointless follows...

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