Lately I this idea for email. It would work like a twitter handle for the user but similarly to domains and dns under the hood. Then you just use this handle to register and receive email communication. If you change email provider or get locked out for some reason you can just update the email the handle points to.
Ringz|9 months ago
If I ever change my email provider I just have to change the catch all rule.
pineaux|9 months ago
maaaaattttt|9 months ago