Static was taking a picture of a spooky tower I still have sitting out earlier. He told me about how they used to have them in his town at one point, so I guess he must really like them.
I've seen it happen a few times, but VERY rarely. I wouldn't be surprised if it's more common now, though, since players now have the option to take photos, too.
All villagers take out their phone and take pictures of things, or themselves. Its just completely random. I've caught Skye taking a selfie in the past, and I've caught Quillson (ugh) doing it on multiple occasions.
My islanders have been snapping pictures with their cellphones for many months now. For instance, you can see my screenshots here -> LINK <-of Tutu snapping a picture, and then her reaction to her own snap.