Yeah, I agree, that's pretty common. I never do that, but I see a lot of people around me do. I guess photo taking is an easy way to store a nice memory that you can return to later and relive some of the positive emotions. It's not bad if you don't overdo it.

I'm mostly like this. I take a few pics of cool things on vacation/at an event/something I built/etc. Sometimes with my camera. Sometimes with my phone.

I email them to my parents who don't live nearby. I share some of them with friends who I don't always see. I send silly pics to my gf who is currently working out of state so we can stay in touch and goof around.

I don't publish them to social sites. The closest is maybe sharing relevant pics in group chats with various friends/family. More often than not, I forget to take photos and then feel a little bit bummed out because I actually enjoy photography and only do it sporadically.