There are multiple high-quality sources and lesson plans available for teachers. I would recommend Common Sense Media--their site has a comprehensive selection of lesson plans and activities that are geared to specific ages and grade levels. Of course, it is sound practice to use and peruse multiple sources to confirm and verify sources and to prevent being locked in a "filter bubble."
Teachers can pay an integral role in teaching media literacy, especially if parents and families are just building awareness of the new and complex issues of fake news, filter bubbles, confirmation bias, echo chambers, and more. Build those mini lessons in to content lessons to help kids be safe and confident online.