Lately, I can't help but notice the vast number of ways social media is deficient compared to real life.
In real life, you get "circles" for free! Whoever you are with in the current moment is your circle, and only they have access to what you "share" during that time period.
There is some leaking through the grapevine, but we have an intution for that and usually handle it decently well. It's often even desired.