It boggles the mind that people are debating whether Bristol Palin's remarkably different face is the result of losing weight or plastic surgery. Try losing weight sometime—it doesn't give you a new chin and popped eyes. I'm not sure what else she had done, but she for sure has a chin implant and did something to her eyes or even her brow, and I'd guess she had fat sucked out of her chin area.
I think she looks quite different but prettier. Now that she's healed, she can get on disabling that fake Twitter attributed to her.