It is too much information when it makes someone uncomfortable.

There actually are some pretty innate and natural reactions to the TMI phenomenon. It's not necessarily down to someone being uptight or hyper-critical.

Sure, we have the option to follow or to un-follow, at will, and to filter what we can see.

Perhaps, when it happens to you a few more times than you would like, you'll understand just where that imaginary line is. Because caring about another person's feelings (from simply being uncomfortable to downright embarrassment, all the way to feeling nauseated) is a pretty good indicator of how enlightened you are.

Social media has definitely brought some new parameters into play. But I think the same general rules still apply in a civilized society.

They always will.