They turn to Facebook and YouTube to find a cure for cancer — and get sucked into a world of bogus medicine

By Abby Ohlheiser Mari pressed kale leaves through the juicer, preparing the smoothie that she believed had saved her life. “I’m a cancer-killer, girl,” Mari told her niece, who stood next to her in the kitchen. The pair were filming themselves for a YouTube video. Mari said she was in remission from a dangerous form …