Some of the reasons why I’m not on Twitter are wonderfully summarized in Gordon Fraser’s The Twitterization of the Academic Mind.
For example this one:
The world may come to us for simplification, but we give it complexity. There is power in that complexity. But it is a power that evaporates the moment we reduce our considered findings to a tweet.
Or this one:
My skepticism of Twitter is not a skepticism of activist scholarship, or even activism by scholars. We bring wide-ranging knowledge to important public questions, and we should be heard. Rather, I am concerned that our participation in Twitter is tacitly endorsing a commercial platform that subverts democratic discourse and collapses the distinction between legitimate and illegitimate forms of debate. Scholarship demands cultivated habits of mind, considered distance, and the unfolding of time. Twitter does not.