[pchm]

> IIRC, Twitter, Google, Dropbox and Facebook also don't allow to enroll multiple Yubikeys.

Don't know about Dropbox, but I set up Yubikeys for Twitter, Google and Facebook recently and they all allow multiple keys.

[mwarkentin]

Yeah, that's just false.. just checked and my Dropbox supports multiple as well. AWS is the only one I know of that only allows a single key.