How can I contact the Board of Ingersoll?

I want to report a leader of this group anonymously we are in a FtM group on Facebook and he told several members of the group to "go off yourselves" over a disagreement where people were trying to respectfully disagree. I have a screen shot of the posting I think it is important that the people of this group know what kind of person Blackhawke really is. He's the type who would tell other transmen to off themselves because we disagree and would call us "violent fucks" No one in this thread condoned any violence we all just disagreed on a word. Weither or not you agree with him or the other members of the group it is never ok to tell people to "go off" themselves.