Links from anyone asking you to "Sign in" to verify Steam, Check your IP to make sure you are the owner or Sign in to get free games are all scams, i dont have the sites so i cant list them.

But please if you get asked to do anything or go to a link your not sure about DON'T they are using this to get your account Info and take your Account.

this is a fair warning because this has happend to 20-30 people i know, just dont let it happen to you, and if possible, send Support tickets to the Steam staff to try and get this Set of Scam Sites took down once and for all!.