Like yourself, I travel in a number of personal and professional circles; dad’s open gym night, neighbors, this project team, that project team, peers via podcasting, peers through information architecture, peers through visual design, etc. Each circle has different values and finds different things relevant. The chances of something I find interesting being relevant to more than one of these circles in almost zero.
Preschools and potty-training schedules are off-topic in a project meeting.
Separate but equal.
Overarching tools with a ‘share’ gesture but lacking a notion of these distinct circles is simply rude. A privacy concern? Maybe – in the same way sharing anything on a publicly accessible URL is a privacy concern.
A complete disregard for how real people live multi-faceted lives? Absolutely.