Those pictures were not of Bristol. They were of Bristols boyfriends sister. And to be honest the pictures were pretty tame compared to what many teans put on their facebook sites.
All white people don't look alike, contrary to the stereotype.
Seriously, though, they're both white girls and that's about the end of the similarity. The photos aren't fuzzy. I have seen them posted everywhere as Bristol. It has driven me crazy that no one else has this apparent gift I have to see that Bristol and Mercedes (Levi's sister) are two different people. Stop the insanity, internet!