As of August 2023, the estimated number of active users for Mastodon, Spoutible, and Bluesky are:

• Mastodon: 1.5 million
• Spoutible: 20,000
• Bluesky: 100,000

It is important to note that these numbers are estimates and may vary depending on the source. Additionally, the definition of “active user” can vary from platform to platform. For example, Mastodon defines an active user as someone who has logged in within the past 30 days, while Spoutible defines an active user as someone who has posted a message within the past 7 days.

It is also worth noting that the number of active users for these platforms has fluctuated over time. For example, Mastodon saw a surge in new users in December 2022 following Elon Musk’s acquisition of Twitter. However, the number of active users has since declined.

Overall, the number of active users for Mastodon, Spoutible, and Bluesky is relatively small compared to other social media platforms. However, these platforms are growing in popularity and may continue to attract new users in the future.