If social media is a place where people are recording a timeline of their thoughts and memories what kind of memories are people creating online if most of their material is meticulously picked through and at most a false representation of their lives?

Why must people create a diversion or anonymous online persona if they are just living normal lives? Are people that are actively putting effort to not be found online are just acting out of self inflated paranoia or are they really pursuing a lifestyle that more people should follow?