My 7 year old gets access to YouTube and that is about 4 hours per week, split between Saturday morning and Sunday morning. His content is of his choice but we make sure he watches something interesting and we have discussions about what he watches: some cartoons and science shows or instructional videos. As far as social media goes, we try to keep it as far away as possible and instead fill his time with a lot of activities and sports and daily time spent outdoors. I noticed when screen time exceeds 4 hours a week he feels bored and having some minor mood issues.