Even if you have nothing to hide, the ability to control that much information about you is a great power over you. The abuse of you personally might not be happening now, but the potential is certainly there. What happens when the abuse of that power comes to you? (abuse of that power is already happening)

I would very much rather have my own email server running local software to read that email and have something like a social network served much like email or through user-owned micro-servers. But software like that doesn't exist in high quality because it needs to be free and you can't get venture capital to make free things (and can't make money off non-cloud free services)