There was a joke going around recently: Twitter finally allows more than 140 characters in direct messages!  Meanwhile, Facebook releases AI powered personal assistant and 12 new open source projects powering their entire company.<p>Is Twitter doomed because they are public?  Their stock is in the toilet, so they are afraid to change anything in case the changes make things <i>worse.</i>  So, things are bad, nobody can change anything, and nothing will get better on its own?  And since their stock is in the toilet, what motivates employees who want to be like all the other cool kids and cash out for millions?  Does everybody abandon ship?<p>Considering Twitter&#x27;s entire gimmick is being a short message broadcast service, how much can they innovate without changing the core of what they are?