The social network is now in league with Avast, AVG, Avira, Kaspersky, Panda, Total Defence, and Webroot, who will each provide software for its Antivirus Marketplace and add to its URL blacklist.
Mark Zuckerberg's company launched the Marketplace back in April, with McAfee, Norton, Sophos, Trend Micro, and Microsoft on board to provide extended trial versions of their popular security software.
Facebook introduced phishing protections and malware checkpoints, and will now focus on mobile security, as Zuckerberg has repeatedly identified this sector as key to the firm's strategy.
The company today opened up a new engineering centre in London, where a team will build predominantly mobile products for the social network service.
Facebook reached the milestone of 1 billion users worldwide earlier this month.