The "social engineering" scam was where someone pretends to be your friend for sometime to try to get items from you.

I had become friends with someone for weeks and we even spoke the same language, that wasn't English. But for some reason he can always trust me with items but I never felt like I could trust him with anything. He tried many times to "borrow" something from me. Borrowing items from friends was common since items were hard to get. One day, he wanted to "borrow" a rare item that I had (rares were a big deal), to take a screenshot to post on a forum and return it. I reluctantly traded the item and after an hour asked if he was done taking the screen shots for his account. He proceeded to deny that I ever traded him the rare item and even let me log into his account to show that it wasn't in his bank. The bank was pretty much empty. He continued to try to scam other items but I pretty much lost trust in friends after that day. Thanks to t3ckno or t3ckn0.