Your online comments can hurt your case, if they amount to an "admission against interest." For example, say you put this comment online: "The accident was my fault." Or "I am not hurt but will pretend to be hurt." Yes, such comments can be used against you.
I do not handle cases like this, but the law firm of Kafoury McDougal in Portland does. You can reach them at 503-224-2647 or [email protected] They provide an initial consultation visit for you at no charge, and they usually take cases on a "contingency" basis, which means that you do not have to pay them, unless they succeed in obtaining money for you from the entity that harmed you.