The Insanely Rich Young Mobile Ad Broker You've Never Heard OfRyan Tate11/09/09 4:36pm7EditPromoteDismissUndismissHideGo to permalinkNo one knows what Facebook and Twitter are really worth, sexy though the startups may be. But AdMob, an obscure company in Silicon Valley's hinterlands, has a very clear, solid value: $750 million in stock from acquirer Google. Yay boring!