@evan No matter whether Bob replied as "followers only" or " everyone", Bob's followers should be able to see his reply. They shouldn't be able to scroll up and see Alice's orignal post unless they also follow Alice. But Alice's choice for her own post should not override Bob's choice for his.
@evan You've never asked anybody who has a private or follows only account about this have you? There doesn't need to be a massive data, but takes one response and it becomes really difficult to decide to follow the sloppy pattern and keep pushing it forward.
So that etiquette would demand that Bob limit the visibility of his reply to just Alice, and let her decide how far it should reach beyond that. There's a certain grace there, but does the etiquette of telephony translate to microblogging?
I’ve always modeled this challenge as a set theory maths problem and the answer is the original set regardless of who is replying, as the original poster set the limiting constraint conditions + selected the members of the group with access to the conversation thread. Plus there are “n” Bob’s, where “n” is the number of Alice’s followers.
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