I think twitter is great for one reason: It takes away the ridiculous notion that writing is elite, difficult, the domain of the few.
That stubborn old belief dates back even further than Medieval Times, when clergy wrote and nobody else could. Like most dumb ideas, it’s about power. Only some can speak, and few can rule. Those who DO rule are heard. Others? Not so much.
I think twitter is terrible for one reason: It takes away the valid notion that you should give some thought to what you write.