Scams are everywhere even in social media we have to be very careful with so many fakes account just to scam people. To avoid these scam we have to research if it is really legit and always look for proof that may answer our doubts. Although at first it is hard to identify but in terms of our money to invest we must do to avoid scams.
Also don't believe people who are using bitcoin to scam other people. They will come at you and say "do you want to earn money, you money would be double in just 1-3days", they are funny because they are desperate to scam you, they will convince you by their sweet words that have no future at all, and if you fall for their trap since you like easy money, well don't be mad at yourself, if you know what I mean
They usually used the ponzi scheme strategy in scamming people, and bitcoin was their escape goat for this evil acts. Their convincing power with a package of lies will deceive a lot of followers, who would become their prey in the long run. Personally I was a victim of this type of scheme, using fiat money investments offering money pyramiding promised to give 80% return of investment.