group posting bot

Do anyone know how to send message to every member of a facebook group? (answer perspective from that group admin or just a member)

Hey, I need a facebook bot that has the ability to simulate a real browser when posting to groups and that can be switched between different user agents. Does anyone know if such a bot exists somewhere? Or if someone could code such a bot please pm me with the time it would take you to code...

Let me know if anyone can create a tool or already has a tool for posting on multiple groups with multiple profiles so that they dont get banned.