FWIW, I actually enjoy twitter and get plenty of value from it (by selectively following interesting, intelligent people who post about things I care about) ... but your description is pretty funny -- and probably apt, at least for a sizable % of its users.
I personally had to leave twitter. I found a lot of value from it but despite keeping what I followed to a strict curated list, the 'outrage mob' seemed to always bleed into feed. Unfortunately it wasn't worth the value I got out of Twitter
I have received multiple requests for opening my DMs to people and I always tell them to mail me. I don't consider Twitter capable of storing sensitive data.