Just see here
NO PURCHASE NECESSARY TO ENTER OR WIN. Open to legal residents of the United States and District of Columbia, 18 years of age or the age of majority in their state of residence, whichever is older, as of the date of entry. Void where prohibited. Ends 8/12/13. See Official Rules for complete details.
This promotion is in no way sponsored, endorsed or administered by, or associated with, Facebook. You understand that you are providing your information to Chevrolet and not to Facebook. Unless you have chosen to receive more information, the information you provide will only be used for this contest.