Facebook chief technology officer Bret Taylor is stepping down from the company later this summer to join an unnamed startup. Taylor find himself often arguing with Facebook CEO Mark Zuckerberg. Before Facebook, Taylor was the co-creator of Google Maps and the Google Maps API. Taylor was CEO of Friendfeed when it was acquired by Facebook for $50 million. While at Facebook, Taylor oversaw platform and mobile, which included the Graph API, Open Graph, and App Center.