I hate selfies, so whenever I'm on vacation I just take pictures of my surroundings but never with me in it. Once, my cousin wanted to see my vacation pics, so I showed them to him. He then asked why I'm not in any of them. When I said I didn't think it was necessary, his genuine confused reply was, "But how do people know you were really there, then?"
Sadly, this was a thing even before the web, let alone social media. There’s always been people for whom the vacations didn’t even “happen” unless they get to go on incessantly about them when they come back, ideally subjecting you to two hours of photos that mean very little to you. They derive little enjoyment from actually being there, they take it from showing it others…
For some people life is not worth living without external validation. Sad.
I understand wanting to share pictures of your trip and stuff, but if it's such a compulsive need you wouldn't be able to not do it, you've got issues.
Uh gee, for starters don't go around broadcasting that you're not home. Watching your stuff.
Do you want property theft?
Because that's how you get property theft!
You can brag and selectively post all the highlights and none of the lowlights when you're back if you think that you need that to feel better about yourself.
The problem is that there is no clear definition of a post. Sure, a tweet or an Instagram is a post. A private message to a friend is probably not a post. But what if you send images of your vacation in a discord server with many friends? The line gets fishy, and if I couldn't talk to friends, independently to the trip itself, while on vacation, I would also say no.