1,"you have won!"some scamers told you have won and ask you to pay some fee before
you receiving the prizes.
2,they refuse use paypal but ask for bank directly.(you can ask for refund in
3,someone ask you to trade,and soon one another person talks with you with a
similar id,like Johny/Jonhy.and you may get trapped.
4,they use photoshop to make fake pic to let you believe their products or other
thing and you may be scamed.