The Social Dilemma is a documentary-drama hybrid that explores the dangerous human impact of social networking with tech experts sounding the alarm on their own creations. Its a fantastic film and should be required viewing for anyone that spends time on social media. Most people are not aware of the extreme levels of psychological manipulation they are exposed to on services like Facebook, and the documentary should be very eye opening.
If you find the documentary interesting, I also highly recommend the book LikeWar: The Weaponization of Social Media which covers topics such as how Facebook was used to incite genocide in Myanmar, and how social media is being used to attack democracy around the world by nations such as Russia.