Response to Admission on social media

I don't really post , but i don't want someone going through all my posts and stuff . And trying to know everything like sites i might visited and people that i may talk to or interact with.And so there should defiantly be limitation and privacy rules.because it not necessary for something to be view and could cause issues.Especially if there fakes accounts or someone you may be friends with say or post something that the person looking through you account might not understand and take the wrong way.