Scam or Real??

At 1st i saw such e-mail saying that giving free laptop or hand phone to any email users who help to forward the email to others to increase the popularity of the brands, in the 1st place how the brands or company track the e-mail account is yours or not?? it look so fake.... but recently new ways of trick being use, they use picture to make it look more real but if u think back u will know all this is fake... they dun need u to increase the popularity, they are a really well know brands area the world... so y such E-mail still out there?? isit people use it to prove that the spam/chain mail really works??