[tomxor]

Does MIT encompass BSD?

If it doesn't then surely they can't just re-license code that was contributed by others without their permission.

I'm not fundamentally against this and I doubt anyone cares in practice, it just doesn't seem right in terms of the contributor's rights.

[simonlc]

If you contribute to fb open source you need to sign a CLA: https://code.facebook.com/cla/individual