but are you using your private key to assign your wallet to Bitcoin Talk profile?
I don't really get your question, could you rephrase?
I think he confused something. People are posting their Bitcoin wallet addresses with signed message to secure their accounts. If your account will be hacked, you will have to send signed message from staked Bitcoin address to admin and then you will have chance to get your account back. But you you should never post your private key in public!