Recently decided to do a part time uni course after more than a decade of being out of school (time flies), and I'm having a hard time working out what's the "norm" with regards to social media and privacy expectations.
I don't personally use Instagram, and have no interest in it. Yesterday though, a mate of mine showed me a post (in a "didn't know you knew this person" context) that one of my group mates posted during our meetup to discuss something related to the course. It was one of those "what we're doing now" 10s clips I guess but in it you can clearly hear and see me in the background talking about something I don't want published! 
Now I'm paranoid about how many of these are "out there" (her account is on private but she's got 5 digits worth of followers). Don't want to ask or anything too because I've still got to work with them for the rest of the sch year and am not keen on coming across as the "mental one".
Would you be bothered by this? Or am I just an old fogey?