I saw lots of advertisement on my Facebook News feed about PLEXCOIN. Tried searching for it on google and some articles says that PLEXCOIN is a scam. One reason I saw is that its whitepaper is not available not until their pre purchased is finished and refunds is allowed only on pre-[urchased period. However, lots of people are buying it. I have plans on investing on this coin. On your opinion, is it scam or not? Thanks for helping me decide.