How Much Information Is ‘Too Much Information’?

How much information about casual acquaintances is “too much information”? How much personal information do you put out on social media platforms like Twitter or Facebook? Do you often “stalk” others there to find out about them, even if (or maybe especially because) they’re people who are no longer in your life? Are there people you have blocked on Facebook so that you don’t have to read about them? Why?