Is there any loss of privacy while using 2 Factor authentication?
If you use Google Authenticator on an android phone (where essentially you have linked your google id), to authenticate the login of a third party website, can google link your google id with the credentials of the third party website?
John Macafee got hacked from using 2FA. It gave the hackers the ability to recover his phone number. Read about it by googling it. I never liked the idea of it anyways because of a few reasons. I have turned it off since Macafee's hack back in December.
Read my previous posts... that's why I outline that you have to have another phone which will be offline all the time. Security issue here is if an attacker gain control over your phone and you keep everything together on your smartphone. If you are lodged in to many accounts + have 2FA, when an attacker gets to your phone it is game over as everything is on one device.
John, himself, was attacked due to him saying coins of the week and therefore pumping them across multiple exchanges which as a result made him good target.