I was terrified this morning when someone else's photos appeared in my "photos" tab in my phone's Dropbox App. I share a Dropbox folder with someone who usually uploads documents, not images, but when they uploaded images, all those images showed up, completely pushing recent images out of view. It was a scare for sure--I thought someone else's photos were appearing in my phone and feared mine were therefore appearing in someone else's dropbox app. I wanted to post this experience just in case someone else has this experience. If you see a lot of someone else's photos - check to see what shared Dropbox folders you have.