I Share What I Want. Not You.
Ok, time for a bit of truth, so please pay attention. You choose who you follow on any social network.
You control what updates you see based on who you choose to follow, how you set up filters and what you decide to read.
Thus, you can not complain about someone tweeting, posting or sharing too much. Complaining about this is like complaining that the water is flowing too fast in the river that you've made a point of crossing. Don't like it? Choose a different river.
It is impossible for someone to "over share" because they choose what they want to share with their community and they control the flow of information. If it is too much for you, then stop following them and be on your merry way.
Thanks for listening.