Addressing the above extortion attempt...

I told the user not to send funds to escrow. I told him the deal was too good to be true and that he was dealing with a scammer.  He didn't listen and sent the funds anyway.  He then immediately wanted a refund and sent several messages asking me to refund an address. The other party was non-responsive and I'd sent several messages confirming the refund address and waited a few hours for communication and verified all communications were with 1 account. So I refunded the only account I had been in communication with. Immediately after he starts accusing me of stealing his funds and lying about the messages which wasn't a problem for hours until BTC was sent. He tries over and over again to get me to call him on the phone and when I refuse he starts saying he's going to sue me if I don't pay him $1600. He refuses to contact the site mods to see if another ip logged into his account and only wants me to pay $1600 for him doing the exact opposite of what I said to do and then trying to use that to extort me.

It is a shame that with every big increase in price comes a new wave of pathetic scammers. However, I'm not going to pay an extortion fee. Ever. Your time is better used elsewhere and you are responsible for securing your own bitcointalk account, not me.

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EDIT: I forwarded the screenshots to the account that sent them as requested.  Now the user is claiming he's been locked out of his account and accusing me of all sorts of nonsense, yet I don't see any messages being sent to the seller that supposedly scammed him, nor any threads to try and reclaim his account.  He's now making threats and it's clear his demands are endless.