I agree with the pp
Also, be sure to check your district's policies as well. Effective or not, it has to be allowed or grief will follow. Then you need to get all of the participants to follow those rules as well.
I can see it being a good tool at some level. Technology appeals to many teens.
In my high school, very few students still use FaceBook itself. Many have switched to Instagram, TikTok and others I am not savvy enough to even know. Some of those accounts do link back to the original FB but many do not.
I am not opposed. For those students, 13 and under--I am asking. Will NearPod, Google Classroom, and similar sites fill that gap? Or can you make a classroom website with a Discussion area or Blog Q and A for the Book Talks? I am just thinking out loud...