With a grain of salt (or several grains) I like craigs list - has helped me sell much stuff. However they make no effort to keep scams (esp the ones that offer ways to make money) off. Many scams are obvious to the ones of us who have been around, however some are well baited - - beware
Uber is pretty good for riders - a real scam for drivers, wear out your car for less than minimum wage in most cities - - the amount they "claim" one can earn is a lie and a few drunk riders will bring your rating with Uber so low they will fire you - - thank you Uber for firing me