I sold 13BTC to my honest "firend" from usa, i know him about 1 year, and guess what, he is scamer!
got £1400 then withdraw everything to my bank account, few days later i get negative of £1400! Money has been returned to sender. thats it.
That is not necessarily the case (that he is a scammer). Paypal is known to sometimes reverse transactions out of their own initiative, without any intervention of the sender, just because Paypal doesn't like something about the transaction. I know it for sure, as Paypal once to my surprise reversed my payment to someone, without my will. Without any real reason, maybe just because I used TOR to connect to Paypal for that transaction, as I use TOR often even without specific need if it works reasonably fast.
That is not always the case either, I actually bought about $400 or so worth of coins from goat
who posted in here saying not to use paypal hehe. Paypal actually called me about 3 days later asking if this payment was legitimate. Of course I said it was they proceeded to ask me several questions on why I sent it as a service of course I didnt tell them it was because I was buying bitcoins. I told them essentially the user provided me a service that was rendered and I am satisfied. I kept it short with them and didnt give them my entire life story on what I do with my paypal account. The less info you give them the better, but on the other hand paypal does reverse transactions without informing the buyer to. Its happened to me a handful of times and trust me i've almost gone into cardiac arrest because of it.