Well, we came for the white feminists, and now we sent for the black men.
I don't have a ton of details on this hashtag, and I'm not sure of the origins yet, or who started it, but I did find this article about the fact that black women's issues are undervalued in relation to the issues of black men. (Like in the original civil rights movement) I also have this great link to a debate between Gloria Steinem and Melissa Harris-Perry where MHP touches on the ways in which WW and BM have often colluded to push aside the needs of black women, and fail to realize the intersection of femininity and blackness, in the context of the 2008 Democratic primary. Lastly, I have this Storify of tweets by noted awesome black lady feminist Mikki Kendall about the harm that the "Strong Black Woman" trope does to black women.
[EDIT: After extensive twitter creeping, I have concluded that this hashtag evolved organically from the original SIFWW hashtag. It seems that BW first tackled the racism they face from white women, and are now tackling the sexism they face from black men. Because they're awesome, and on fucking FIRE this week.]
Much like Solidarity Is For White Women, it seems like #BlackPowerIsForBlackMen is about pointing out the ways in which black men are complicit in the oppression of black women. Some of the tweets are very insightful (as usual) so I'm posting a few of the ones I think had the most impact.