Yes, pics or it didn't happen.
Remember, I can look at your posts.
But you can't look at my daily life ;D
How am I supposed to take a picture of something my parents have filed away somewhere upstairs that's probably mixed in with 50 billion other things that nobody cares about anymore? Not only that, but just because I take a picture of it does not mean it is real. I could forge a document, and take a picture of that. There's no real way to prove something with a picture.