This is amazing news, and I hope Twitter adopts this policy for all rules violations. Much better than deleting tweet or banning accounts, this lets people decide what they want to see. (Except for obvious spammers etc. which should probably be banned.)
Even better would be if there were user-configurable "lists", whereby you could decide upfront what you want / don't want to see (like many sites do right now with NSFW content) - the default filter would be very "protective" (no porn, no violence, no gore, no hate speech) but users could turn off any or all of these "filters". The next step is the addition of user-curated "lists" / "filters" (e.g. "no democrats", "no republicans", "no vegans", "no dog lovers", ...).
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