I have a lot of those as well. When I first installed Supernatural and started the Callahans I noticed a few, but now they are all over the house and outside. I think one was even blocking my Sim, although I didn't think they could do that. I was afraid to delete them at first because I didn't know what they are, what they do, or why they exist, but they've become quite annoying. And they show in my screenshots which I don't like.