"Twitter rival Mastodon has grown eight times its size in a matter of weeks, going from approximately 300,000 users in October to 2.5 million in November, according to a blog post by the platform’s founder, Eugen Rochko": As Twitter backlash grows, rival Mastodon reaches 2.5 million monthly users | CNN Business https://www.cnn.com/2022/12/20/tech/mastodon-twitter-usage/index.html