Used the API and a script to block people with words like "hate" in their bios. It went a bit far, but in general made it a more pleasant experience. I stopped doing that a while ago, but once you have a lot of people on a block/mute list, there is no easy way (that I can see) to remove them as...
I don't think that many people have actually left Twitter - though I'm sure some have stopped using it but left their accounts intact.
I used to run a program to block/mute accounts I had no interest in reading. Back on the 8th of November there were 115,919 of these accounts live on the...