For users managing multiple business accounts, "Facebook Proxies" are used to mask their real IP address Risk Management
Some people may use a proxy to access Facebook for various reasons, such as:
Setting up a proxy for Facebook involves configuring the network settings of a device or browser. On
Less commonly, an individual might use a proxy to circumvent a temporary IP ban imposed by Meta for spamming or scraping.
How to Unblock Facebook using Residential Proxies - Proxyrack