The popularity of the video conferencing app exploded during the COVID-19 outbreak, becoming essentially the industry standard for video conferencing and remote work meetings.
Facebook's Facebook Graph API is connected to Zoom after downloading and installing, which is not unusual, since many app manufacturers use Facebook software development kits (SDKs) to implement features in their software.
Among other things, Zoom notifies Facebook when the iOS app is opened, what device the user is using, what media they are on, and what city and time zone they are connecting from. The data also contains a unique advertiser tag associated with the user's device, which companies use to target ads.
This is not the first time Zoom has encountered a privacy or security error. In 2019, a security researcher discovered a zero-day vulnerability that made users vulnerable to webcam hacking without their knowledge.