The press often carries articles about such conversions, including testimonials. The Gerson Institute promotes the therapy by citing patient testimonials and other anecdotal evidence. Substantiated means there must be evidence, testimonials, and witnesses to support the facts stated. Other forms of advertising included the use of memorable jingles, sensational testimonials, and scare tactics. Instagram especially has increasingly been useful in distributing testimonials on products and places. He later documented its usage and reported its effects through personal testimonials. Testimonials from smoking female celebrities were used. Others engaged in protracted correspondence and had employers send testimonials. It was an evening of prayer, stories, traditional Irish music, and personal testimonials about Judge. But assertions, speculation, and testimonials do not substitute for evidence. These "video testimonials of supposedly recovering Civilization addicts" also featured cameos by Sid Meier. He left two testimonials that were featured on books. Even special musicians like Duke Ellington have praised Armstrong through strong testimonials. Other testimonials to his influence followed. This concerned accusations of scientific misconduct in the same secret testimonials.