Twitter Has Become a Park Filled with Bats and Perverts
nymag.com
nymag.com
I suspect it's simply a network size problem - once Twitter hit a threshold of users it got too noisy. It's ironic that Twitter's value is considered to be the size of its audience whereas that might actually be the exact thing that's killing its usefulness.
On the other side is the FB model where one is forced to use real names and a single account. That in turn exposes people to bullying in real life and forces the freedom of speech on a kinder-garden level.
Then there are models where identity is tied to commercial assets (Amazon, Apple) where banning has potentially devastating economic side effects.
Free anonymous accounts that cost nothing and are all powerful are not helping civilized discourse. Commercial accounts are not simple either. But what are the alternative?