This thesis explores the spread of misinformation and conspiracy theories across online messaging platforms like Telegram, WhatsApp, and Discord. It addresses the lack of research on these platforms by analyzing public groups discovered on Twitter and examining the exposure of personal information. A detailed study of QAnon-related Telegram groups reveals the multilingual spread of conspiracies. Additionally, the research investigates message forwarding patterns and the lifespan of content within fringe communities, offering insights into misinformation dissemination.