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The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
I believe this is an AdGuard filter rule, or at least it might work as one. This filter would block all http(s) traffic from the domain facebook.com including subdomains. ^ is a separator between the pattern and the rule modifiers. ||facebook.com^ alone ia rule, and would block all traffic from facebook.com. $ signifies the start of rule modifiers following the pattern. client='' is a rule modifier - I'm guessing it restricts the rule to that IP address but it doesn't seem to be a standard AdGuard rule modifier, I couldn't find it in the docs after a few minutes.
In https://github.com/0xERR0R/blocky you can define client specific block lists.