Have you got a telephone directory? http://thisav.fun/ thisavcom Unlike Google and Apple, which built out their mobile-adbusinesses by acquiring startups, Facebook has relied mostly oninternal development for this piece of its intellectualproperty. That may have helped it better customize mobile ads toits service, said Lars Albright, who co-founded Quattro WirelessInc. -- a company sold to Apple in 2010. That startup became thebasis for iAd.