Funny How to avoid scamming?

Just a tip as well. Pay with PayPal if that's an option. What you can do with PayPal is chargeback companies if they do not complete your order (with other words scam) and you can always get your money back. I use it very often and I've got a lot of lost money back.
Since chargeback can only be done with non-friend/no donation payments, I'd recommend not sending money to people as a friend or as a donation. Otherwise if they scam you, you can't do anything about it.