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But that's not what spam means.
Just curious, how would you define spam? At any rate, right now I am not ruling out a global list. However, I am still entertaining the idea of developing to a point where there is no common feed like 'all posts'. If we do get to that setup, blocking some submissions might not be necessary. For example, Twitter doesn't care what I submit. If no one follows me, no one has to see it.