Facebook, looking to better secure the vast amounts of customer data stored on its servers, agreed to acquire the cybersecurity company PrivateCore. PrivateCore, which received $2.25 million in funding in 2012 led by Foundation Capital, released a product that scrambles data held on computer-memory chips, protecting it when it is being transferred or is in use. Last fall, it was a winner at CloudBeat Innovation Showdown. Terms of the deal, including how much Facebook paid for the Palo Alto, Calif., company, weren’t disclosed. Facebook declined to comment beyond a post on the social network by Joe Sullivan, its chief security officer. “I’ve seen how much people care about the security of data they entrust to services like Facebook,” Sullivan said in the post. “PrivateCore’s technology and expertise will help support Facebook’s mission to help make the world more open and connected, in a secure and trusted way.”