Apple device users are seeing an increase in FaceTime group call spam, with some forced to block hundreds of unknown numbers due to largely ineffective built-in privacy safeguards. Detailed in an Apple Support Forums thread and social media posts, FaceTime users are facing a deluge of group calls from unknown numbers and accounts. Suspected to be the brainchild of "griefers," these calls can trigger a chain reaction resulting in multiple, quick-succession callbacks in a short period of time. As noted by ArsTechnica, which first reported on the issue, pranksters can call up to 31 number...