I just heard some of my friends chatting in a gathering and they think Bitcoin is scam and Ponzi. I just give them a smile and wish they will educate themselves a bit.
So, I would like you to give me some suggestions, how I can give them some hints with soft words which can change their mind or at least give them some more space to think twice?
If that's their opinion about bitcoin then let them be. You don't have to convince them or force them to believe what really bitcoin is. Some people really think of it as scam since most of them haven't had enough knowledge about it. I believe that people who are too close minded about it are those who always think negative about it.