Something about seeing screenshots of your phone showing the same posts I see reminds me that you're a real human person in realspace. An obvious fact, but an ephermeral-feeling one, normally. "Somewhere far away, someone is looking at the same moon" vibes.
The profound feeling of realizing that everyone, including strangers passing in the street, has a life as complex as one's own, which they are constantly living despite one's personal lack of awareness of it.