Social media platforms are common channels through which confidential information may inadvertently or maliciously be exposed due to their wide accessibility and the ease with which information can be shared. The scenario described suggests that the firewall did not filter certain types of outbound traffic, which could include access to social media sites where sensitive data might be posted or leaked.
Reference:
CompTIA IT Fundamentals documents often emphasize the role of network security protocols and configurations, including content filtering and firewalls, as critical for protecting against data leaks, particularly via platforms like social media.