Twitter's biggest external spam problems are: • abuse of @-replies • unsolicitied DMs …which both grow with account size (& other forms of prominence, & cert

Twitter's biggest external spam problems are: • abuse of @-replies • unsolicitied DMs …which both grow with account size (& other forms of prominence, & certain topic-areas), so your anecdotal testimony that it's not in your feed doesn't do much to qualify or refute the magnitudes of others' problems. Twitter's biggest internal spam problems are: • Twitter's ads are repetitive, poorly-targeted crap • Twitter does not provide reliable ways to disable their unwanted inserts – quickly ignoring any number of 'see less often' choices, and doing things like randomly reverting people from their chosen 'latest' to Twitter's algorithmic 'home' feed. As fair definitions of 'spam' or even more generally 'harassment' include "continued unwanted interactions against expressed preferences", this means Twitter Inc is the biggest spammer/harasser on its own platform.