I am looking to invest 0.10 bitcoin in zooo.cc. Can someone give his opinion on whether it is a safe investment. I don't find any negative reviews about them on google but still i find it hard to believe that they can double my money in 20 days.
No one can legitimately double your money in 20 days, so read up on Ponzi schemes - they might pay you, but if they do it'll be out of the pockets of people who "invest" later, and then when the time is right they'll run off with everyone's money, so it's not a good idea even if they're going to pay. You don't want to legitimise them.