Can you give inquiring mines a tidbit more information?
Links to the posts?
How/where were the Paypal transactions originate?
What are the scammers' usernames at the exchange?
How much were the transactions (okay, this is pure nosiness at this point)
Etc.
So it sounds like the person who's slandering you was the other victim in this man in the middle attack (I'm learning so much about scams from this site).... if that's the case, the two of you should at least try to work together and find out who scammed you. The scammer had to have reached out the the other victim and got him to pay somehow, right?
It's an adventure! The two of you working together playing bitcoin thief detective