Oversharing on social media - who, what, where, when, why?

One of the main issues I have with location based social media apps is that to use them, you must publicly tell the world where you are and what you are doing.

Some of my Facebook friends have a subtle way of sharing using Facebook Places so you get an update to say they're checked in at a train station or the airport so I know they're officially off on their holidays. I think that's sweet, but I don't like the fact that everyone else 'checked in' also knows that, or that they come up as a recent check in when you run a search on the venue.

Why is it that when it comes to social media there is no such thing as too much information? I really don't want to know what you had for dinner or every time you go somewhere. So stop clogging up my twitter feed.