It's a social networking site. The point isn't to just post well composed pieces of art, it is explicitly for sharing snapshots with your friends. It's nice when you are able to post a photo that actually stands on it's artistic merit, but that's not what it was made for.
For example, here's the last photo I posted to instagram. It's just a snapshot of me and my GF. No photographic merit as far as composition or anything. This is what instagram was made for.
Untwist yo panties dawg, not every photo has to be worthy of hanging in MOMA. It's the people's medium.