I've seen those kinds of post everywhere and I'm more surprised by the fact that many people fall for it. There will always be people who will try to get your money one way or another especially in bitcoin who's market is big. Just think about it, you will give someone .5 btc and that person will give you back 1.5 btc in 2 hours. It doesn't make any sense right? But thank you by the way for making more awareness about these scams.