As Facebook tries to take on News Corp.'s MySpace for market share, Facebook has convinced a college dropout, two ex-Microsoft employees, and more than 800 other staff to deploy a new platform that permits those who are not affiliated with Facebook to construct online services that run within its website. Ali and Hadi Partovi, for instance, have the iLike service, and they post 30-second music clips and compare their scores in quizzes that test music savvy with those of friends. Numair Faraz built Facebook Audio and allows people to play full-length songs on their profiles. Facebook now offers over 800 new services that include photo slideshows and online file storage. That number is up from under 100 one month ago, and those creating the Facebook services can gain access to information about their customers and make money by selling related items and ads. A service from Slide permits user to highlight their top friends and recently had 6.3 million users, and a horoscope service from RockYou had 3.5 million users. Also highlighted are the Thinner weight tracker, Socialight for sharing favorite places, and the Carbon Diet Plan. Just as Microsoft allowed Adobe, Intuit and others to build software for Microsoft Windows in the 1980s, Facebook is building a developer ecosystem. Facebook expects $30 million in profit on revenue of $150 million this year, primarily from ads, says those familiar with the matter.