Not all Twitter users are the same.
In a Pew Research Center survey, 22 percent of Americans said they use Twitter, but many are simply listening. The median Twitter user posts just twice per month. A smaller, much more active group of Twitter users post more frequently.
Share of Tweets by U.S. Adult Twitter Users
Top 10% of tweeters account for 80% of content posted to Twitter
Bottom 90% of tweeters account for 20% of content posted to Twitter
Source: Pew Research Center, Sizing Up Twitter Users, April 2019