I do not know what Yubi keys was distributed by Mt Gox, but generally you should be able to reuse it (I don't think I heard anything about some other hardware versions, that ones the Yubico are selling). If you are using Chrome browser, you can use it as U2F for example for Google and GitHub accounts. Other sites and other browser will join there soon.
Download and install YubiKey Personalisation Tool and you should be able to determine what hardware version of YubiKey you have.
And even more - with this software you should be able to program Steemit master password or better Posting Private Key (read why) on YubiKey! How about that :-).
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