Founders of companies acquired by Facebook continue to unfriend their parent company. : Social-networking behemoth Facebook has been going through a rough stretch when it comes to keeping key executives -- specifically, co-founders of companies that Facebook has acquired -- in the fold. The latest to leave: Brendan Iribe, co-founder of virtual reality specialist Oculus, which Facebook acquired four years ago for nearly $2 billion. In a Facebook post on Monday, Oct. 22, Iribe said he'll be taking his time off to "recharge, reflect and be creative." Last month, it was the co-founders of Facebook-owned Instagram who stepped down.