Would you care to explain how that works? It is unclear from @richardrodriguez’s post whether he’s asking about PR or SERPs (and without further input from him, this topic is of limited usefulness), but as both Facebook and Twitter links are nofollow, I fail to see how your suggestion is relevant to either situation.
In any case, a clear explanation is always much more helpful that a one-line answer, so I’d appreciate some clarification of your idea.