DO they check the usernames against a database, or also the actual password (that you may have changed since the leak) ?
In the second case beware you might be legally responsible of leaking the password to a third party, that could well cost you your job... (or create problems with your bank, or any other service which forbids you to share your password).
Short story : they propose to take CO2 (which is a kind of ash), add energy to it produce methane, which will then be burned giving energy and CO2.
SO you get the CO2 you had before and you lost energy (because of second law of thermodynamics + the fact that industrial processes cannot be 100% efficient)
What's the point ?
Let's see this : saying there is one only god is a blasphemy towards all polytheists religions (and cversely). That means that bible is now forbidden in Ireland...
I do NOT want to be dependant on an identity provider be it open or not. For me OpenID is just another tracking device, and what I fear is sites mandating its use.
If you want to control your online identity, refuse the use of email addresses as login or whateverID system, it is the only way.