This a new scam that became popular recently. It's about a site offering a key for 4 cases of yours. Let's see how it work.

Once in a while you'll get a comment saying "Trade Your CS:GO Cases For Keys! (Rate 4 Cases for 1 key)" and a link following it. Once you pressed the link, you'll be brought to a page with a big green button saying "Sign in through STEAM", just like how a normal trading site work.

But once you signed in, a bot will now have temporary access to your steam account. Using this opportunity, the bot will leave the comment you saw on the profile of some of your friends. https://cdn.discordapp.com/attachments/399079952018046976/404250108096413706/image.png

But everything you see is "Send Offer" on the site. Just like every human being, you'll press the button, add 4 cases of yours, and put 1 key of his.

After you sent the offer, the bot will quickly cancel the request as you, and send another trade as you. The bot will add a few of your worthy skins into the trade, which will result in a scam.
https://cdn.discordapp.com/attachments/399079952018046976/404246909449011202/Screenshot_from_2018-01-20_20-12-17.png
https://cdn.discordapp.com/attachments/399079952018046976/404246914335375360/Screenshot_from_2018-01-20_20-12-25.png

here's the original post https://v1.steam.hlxgame.cc/app/730/discussions/0/1693785035817556956/

CS:GO WebCodes

CS:GO Bounty: Galaxer
CS:GO Roll: Galaxer
CS:GO Polygon: Galaxer
CS:GO Labz: Galaxer
♥♥♥♥♥♥♥♥♥: Galaxer

steam://rungame/730/76561202255233023/+csgo_download_match%20CSGO-D73Ur-QwsXd-Kuzh5-L7dRr-xCZAB

Liat profile for more sales!
Send offer Here

NO LOW OFFER!

http://v1.steam.hlxgame.cc/market/search?q=glock+sand+dune