Perry Tam joined Facebook in 2007 when it had fewer than 500 employees, led the payments team behind Facebook Credits, and later co-founded Storm8, a mobile gaming company he built without venture funding that held 9 of the top 10 mobile MMORPG titles by the end of 2009 before its $300 million acquisition by Stillfront. Now a managing partner at Locus Ventures, he's known for emphasizing intellectual honesty, the idea that good decisions should be based on facts and open debate rather than rank, and for changing your mind when the facts change.