This scammer appeared on Facebook wanting people to send him their private keys. If you give anyone your 15 word passphrase or private key to your Bitcoin account, you have given them full control of it.
Don’t even think that if you have 2FA you can protect yourself, they can still get in – a friend of mine was recently hacked and even though he was using 2FA they still managed to take his crypto.
As I’ve always said, keep your crypto in offline accounts. Do not leave massive amounts hanging around in online exchanges. Even better if you can use an external USB key type Bitcoin Wallet that can be kept in storage or in a safe, then it’s PHYSICALLY impossible for someone to take your crypto wealth.
You have been warned!