You don't need to. Autogenerate password for every site, and let them fail within their silo. It's more and more manageable even on mobile devices. If a compan

You don't need to. Autogenerate password for every site, and let them fail within their silo. It's more and more manageable even on mobile devices. If a company can't manage passwords securely, they won't be able to keep your data any more secure anyway, so you should entrust private data to site you don't trust, independently of how they handle sign in.