Twitter CEO apologizes for allowing white supremacist ad

Twitter's Chief Executive Jack Dorseyapologized on Thursday after the microblogging service letthrough an ad promoting a white supremacist group.

"We made a mistake here and we apologize. Our automatedsystem allowed an ad promoting hate. Against our policy. We dida retro and fixed," Dorsey tweeted.

The ad titled "New Article: The United States Was Foundedas a White People's Republic on NEW ORDER website"showed eightwhite children in a field. It was tweeted from an account withthe handle @NEW_ORDER_1488.

Twitter had suspended several accounts linked to thealt-right movement, USA Today reported on Wednesday.

The company, which has also been under criticism for notdoing enough to thwart cyber bullying, said on Tuesday that itwould upgrade some features to curb abusive behavior.

Twitter's advertising policy prevents advertisers frompromoting certain sensitive topics including hate speech ordiscrimination against race, ethnicity, color, religion andsexual orientation.