Yeah, the legal aspect, that's one thing, and others have covered it.
But then there's the question of WHY you're taking photos of strangers and posting them. To be sure, there are perfectly valid reasons. Traveler does it and takes some amazing photos of "real life." Many street photographers do it--people can be quite interesting, and so wanting to capture them being interesting seems perfectly understandable.
I'm no street photographer, and I rarely take pictures of random people (heck, I rarely take pictures of the people I *know*!). When I *do* take them, I rarely post them online. BUT, I can tell you what my two main rules would be (aside from making sure you are LEGALLY allowed to shoot whatever you're shooting), and that is:
1. DON'T be Creepy. MOST of the time, MOST people KNOW if something is creepy, so just don't take the shot if you KNOW it's kinda creepy. If you wonder if it's creepy, it's probably creepy. If nine out of ten people tell you it's kinda creepy, it's probably creepy. :lmao:
2. Be sensitive. If it's clear that someone doesn't WANT their photo taken, don't take it (there ARE exceptions of course: for instance, news photos that show someone well-known in some illegal or illicit activity. If I see the Vice President selling cocaine to someone, *I'm* taking a picture of it. And then I'm running the h*ll away from there.

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But just be sensitive and respectful of others. Also--taking random pictures of kids you don't know is probably not the best idea. Not really any less legal, I don't think, but definitely tops the creep rating for any mom or dad who catches you doing it and could make for some time delays while you explain to the cops that you're not a sexual predator.
