Substack.com distinguishes itself as a leading alternative to Twitter, especially tailored for creatives, featuring a recent addition of a notes feature resembling Twitter's format. While specific numbers for accounts and monthly users may vary, Substack boasts an impressive user base with over 35 million active subscriptions, including 2 million paid subscriptions, as per official company data. The platform's growth trajectory indicates a surge in popularity, with its biggest advantage lying in its appeal to well-known writers and creators. The introduction of the notes feature enhances user engagement, providing a unique space for short-form content.

Pros include a dedicated creative community and established user base. However, potential cons may include the evolving nature of the platform and its ongoing competition with mainstream social media. Overall, Substack.com stands as a compelling choice for those seeking an alternative social space for creative expression.