As i already stated few times , do not ever click on links in steam chat or trade from ppl you don't know or even from "friends" that you have in friends list and don't really know them.
bellow is the story, you can read the original here>> http://www.reddit.com/r/tf2trade/comments/s0h1z/new_scam_do_not_click_links/



This guy adds me: http://steamrep.com/search?q=76561198061569017

Asks me for the price of one of my unusuals. Wants to check that my unusual is not duped and sends me a link, saying it's to check one's bp for any dupes. We open up a trade, he sends the link asking that I check if it's a dupe or not. I click the link, less than 15-20 seconds pass, I re-open the trade window and see that it says "trade completed" and freak the fuck out, a split second later, he deletes me.

Anyways, I have no idea how this works but when I clicked it, he logged in as me or somehow had control of the trade, the thing is that it happened in less than 30 seconds between me clicking the link and him stealing my 6 earbuds and Unusual Defiant Spartan (searing plasma)

Here's the conversation: http://i.imgur.com/qDFIq.png

TL;DR: don't click on any links within TF2.

Edit: To clear some things up:

-I did not have to log into anything after clicking the link. I just clicked it and a pop up window came up saying it was checking my bp and might take a while.

-I did not have any items in the trade window. He had to have added the items himself and completed the trade himself. I am guessing that he tailor made a script to add the specific items I had (earbuds) and then complete the trade since it happened so quickly.

-By the time you read this I hope he's listed as a scammer on steamrep, he appeared clean when he first contacted me.

Edit2: After talking with a few others I am going to guess that this scammer wrote a specific script that added the earbuds and unusual and completed the trade by itself. The scammer was after my unusual Defiant Spartan which I have never advertised as for sale, either that or he was after my earbuds and took a liking to the spartan. The reason he did not take other unusuals is because I would have quickly noticed things were being added on the steam trade window. His script added the earbuds and the unusual immediately, which is why he deleted me almost right after I told him I had clicked it. This script has to work in the same fashion that certain links auto-friend someone or opens up a steam survey if you have steam open.

This maybe appears to be another alt of the scammer, that sold one of the stolen stormy samureyes: http://steamcommunity.com/id/datcaillou

A confirmed alt account of the scammer, used the same tactic on another user. Already marked: http://steamrep.com/search?q=76561198061629670

The scammer/trade hijacker is registering other websites for others to click: http://www.reddit.com/r/tf2trade/comments/s59lp/psa_tf2itemscom_is_another_new_phishing_site/