What is it?A major content delivery network, CloudFlare, has leaked information that could potentially affect hundreds of web sites. This information could include emails, usernames and passwords. Notable sites that MMM users might recognize: Betterment.com, DigitalOcean (MMM's primary host), Patreon.com and Uber.com
More information, up to date.What can I do?Make sure you have different passwords on any information you care about. It might be a good idea to change passwords at any of the above sites.
What else?Anyone wiser than me - please contribute advice! It's possibly no real information was compromised, but today's a good day to take precautions.