While Facebook has made no secret of the fact that much of its backbone is Linux-based, ex-Apple engineer, and now Facebook employee, Christian Legnitto claims that Facebook’s data centers are filled with thousands of Mac minis.

Social media giant Facebook isn’t generally known for its Apple technology use, but a new report suggests that it may have thousands of Mac minis in its data centers. According to ex-Apple engineer, and now Facebook employee, Christian Legnitto the Facebook data centers in Prineville, OR and Forest City, NC both have “racks and racks” loaded with the diminutive computer performing “hundreds of thousands of tests every couple of hours” on iOS software in development.