Twitter is an advertising platform. Corporations advertise to users through it, and users advertise to each other. The character limit is there to turn discussions into slogans.
I quit Twitter a few months back, and I've been a happier person since then. I'd joined because I heard it was the way to "do outreach" and "engage in the discussion" of my field on a daily basis. Really, it was just the less skilled people in my field advertising their politics to each other, while the more skilled people were off using their skills to accomplish real things. The skilled and knowledgeable people I wanted to hear and learn from were not spending their time twittering.
I quit Twitter a few months back, and I've been a happier person since then. I'd joined because I heard it was the way to "do outreach" and "engage in the discussion" of my field on a daily basis. Really, it was just the less skilled people in my field advertising their politics to each other, while the more skilled people were off using their skills to accomplish real things. The skilled and knowledgeable people I wanted to hear and learn from were not spending their time twittering.