As I have seen an increasing amout of people from this forum fall for this scam, I am making this post here. I do not have much information about how this scam works or what will happen to your steam account if you fall for this, but I hope this atleast helps a few people who encounter it. Information about the scam itself below:
If you receive a message starting with "yo" , "wassup" or "how are u doing?" it is best to block this contact on steam for the time being. The rest of the conversation will always go something like this; based on my 3 encounters with this.
And following messages like "bro?" making it look like this really is your friend.
The link can be different, yesterday it was facecup and today wecup, it is all the same. The link instantly takes you to a login page where your only choice is to register through Steam, where the account theft (or whatever) occurs.
good luck have fun dont get scammed bye