I think the lack of Black involvement on the forum reflects the lack of Black involvement in White male controlled cultural activities in general.

Black feminist Patrician Hill Collins is much more articulate about it however:

"Because elite White men control Western structures of knowledge validation, their interests pervade the themes, paradigms, and epistemologies of traditional scholarship...Black feminists thought's core themes of work, family, sexual politics, motherhood, and political activism rely on paradigms that emphasize the importance of intersecting oppressions in shaping the US matrix of domination. But expressing these themes and paradigms has not been easy because Black women have had to struggle against White male interpretations of the world." (pp 251-252, Black Feminist Thought.)