I heard my camera click while visiting a web site. Fortunately, whoever did that just got the side of my thumb as I just happened to have the camera covered up at that instance. The indicator light was not on. There was no new picture in my photos though. I rarely take photos and I never post them.
I think if you allow access to your pictures to a Web site, then a Web site may be able to look at all of them. They may even be able to download them all.
I put some dark tape over the camera lenses last week.