https://techcrunch.com/2018/10/30/twitters-doubling-of-character-count-from-140-to-280-had-little-impact-on-length-of-tweets/

Twitter’s decision to double its character count from 140 to 280 characters last year hasn’t dramatically changed the length of Twitter posts. According to new data released by the company this morning, Twitter is still a place for briefer thoughts, with only 1% of tweets hitting the 280-character limit, and only 12% of tweets longer than 140 characters.

Brevity, it seems, is baked into Twitter – even when given expanded space, people aren’t using it.