Why were they mentioned in the Facebook hearings?

The sisters received a note from Facebook on April 5 that said the company determined the content on their page to be “unsafe to the community.” They said the note, along with a decline in traffic to their page, was proof that Facebook has an anticonservative bias.

Their Facebook woes have been heavily covered on Fox News, and their case was taken up by Republican lawmakers during the hearings, including Representative Billy Long, Republican of Missouri. He asked Mr. Zuckerberg, “What is unsafe about two black women supporting President Donald J. Trump?”

Mr. Zuckerberg said “nothing is unsafe” about their support for the president. Diamond and Silk responded to two interview requests with an email that said, “Statement: We’ve made contact with Facebook and are looking to get this matter resolved.”

On Thursday, a Facebook spokeswoman said the note the company had sent to the two women should not have been sent and was a result of a communications problem, not a partisan bias. She also said any dip in their traffic was caused by new policies that show Facebook users more posts from friends and fewer from public pages.

She said Facebook was investigating how the note came to be written and sent.

Do Diamond and Silk have critics?

Yes, they do. They have been criticized for supporting an administration deeply unpopular with African-Americans and being unrepresentative of African-American women (94 percent of female African-American voters cast ballots against Mr. Trump).

Bree Newsome, an artist and activist, described them in an interview as “a modern-day minstrel show” aimed at “white conservatives who want to believe Trump can’t be racist or they themselves can’t be racist because there are these two black women named Diamond and Silk who are constantly rooting for Trump.”

Ms. Newsome said their performances relied on “stereotypical images of black women” that would not be celebrated on conservative media if they were not Trump supporters.