Maybe it does already happen? Then again, I don’t want it to always happen!
Cross-posting itself can also be a form of commentary. For example, c/London might cross-post something from c/NewYork — “Hey, this would be a cool idea for our city too!” Or “They’re talking about us. Thoughts?” — and the separate set of comments are desirable because they come from a different community. I want these to be two separate posts sometimes.
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Multi-communities seem similar. Is that a grouping the user makes? If so, I think that’s too much work and will still lead to unnecessary fracturing. What if I follow a few Technology communities and a new one is made since the last time I checked? Do I have to go through and manually check if all my multi-communities are current?