If I am at a cocktail party, and something is said among a group of friends, I know I won't "out" anything if I only discuss it later with those who were origin

If I am at a cocktail party, and something is said among a group of friends, I know I won't "out" anything if I only discuss it later with those who were originally within earshot. I appreciate how Google has brought this into the electronic realm. I do wish there was not a 21 person limit because I already see people sharing with much larger pools and you don't know who persons 22...n are who can also see the discussion.