Is it permissible to work as a real estate broker by advertising properties in Facebook groups and agreeing with the owner on a certain percentage in exchange for bringing buyers?

This brokerage is permissible, and there is no objection to it being conducted through social media or by phone. You may benefit from the agreed-upon percentage in return, as long as it does not involve assisting in a prohibited sale.

Brokerage is considered a form of ju'l (payment for a service) according to jurists. The fee obtained by the broker is called ju'alah, and it is a condition that it must be known.

Jurists differed on whether the fee can be a percentage of the profit. The majority prohibited this, while the Hanbalis permitted it.