The percentage of Twitter users who are active is not known. Twitter does not release this information publicly. However, a study by the Pew Research Center found that 8% of online adults in the United States used Twitter in 2018. This means that Twitter had around 22 million adult users in the United States that year. The number of active Twitter users globally is unknown but is likely to be much higher. Twitter has been growing in popularity in recent years, and as of 2019, it has over 321 million monthly active users.