Last week, Bluesky opened up its doors. After a year in an invite-only closed beta, anyone who wants it can now sign up for an account with only an email address.
Even if the value of an invitation had lessened somewhat in recent months (I have five sitting unused, and not for want of trying), there was clearly some pent-up demand. In just two days, the service has seen more than a million new signups. For comparison, it took Bluesky more than three months from the release of its iOS app last February until it hit 70,000 users.