What should I do about the spread of backbiting in WhatsApp groups that I do not wish to leave for personal reasons?

A Muslim's presence in social media groups that may occasionally include backbiting is not forbidden, as long as the original purpose of these groups is permissible. He is not obligated to constantly monitor them. However, if he is connected at the time backbiting is published, he must object. If the publisher does not respond, the matter shifts to the group administrator, who bears responsibility for what is published within it. The administrator must advise the perpetrator, then warn him, then remove him if he persists. And whoever causes a sin bears its burden and the burden of those who follow him.