I agree with Jeff that sales people should be the ones social networking. However, dealers should be monitoring their reputation and continuing to further their brand presence and appeal. That can be a great opportunity with the right staff, image, or managed solution (like ours. *end shameless plug*).
Bobby, generation Y is an information generation. They're looking at you, your competitor, and your competitors competitor before they even consider giving you a call. Given that, price is a losing battle anyway. By telling your story and engaging them you're more likely to have the opportunity to close the lead, really, regardless of price. The feedback I've directly gotten when I was working on the dealership level was extremely positive specifically on Twitter.