You just got your first proper social account. You've been posting photos — you at the park, you in your school uniform, you outside your house with your street sign just visible in the background. Your follower count is climbing, which feels great. Then you notice that some of your new "followers" are accounts you don't recognise at all. Grown-ups. Profiles with no real photos. People who have never said a word to you but are watching everything you post. Your account, it turns out, is set to public. Anyone can see all of it.