I´m very sorry to hear about your problem. I´m sure you feel bad about what happened, and that you won´t make the same mistakes in the future! Social networking sites can be fun, but they aren´t the right places to invite guets to a party- as you found out!
Have you affered to help pay for any damage? You could get a weekend job to earn some money. Why don´t you try doing some extra housework at home, too? It might show your parents how responsible you are. Finally, my main piece of advice is to talk to your parents about the situations. Promise never to throw a party like that agains, and ask them what you should do to win their trust back.
Good luck. Your parents won´t stay angry forever, so be patient!