Like most public figures, Sarah Palin is no stranger to negative remarks on social media. But rapper Azealia Banks' violent comments toward the former Alaskan governor on Twitter -- calling for Palin to be ganged raped because she endorsed Donald Trump for President -- would seem to violate Twitter’s own user policy.

Under the category “Abusive Behavior,” the social media giant states on its website: “In order to ensure that people feel safe expressing diverse opinions and beliefs, we do not tolerate behavior that crosses the line into abuse, including behavior that harasses, intimidates, or uses fear to silence another user’s voice.”

Azealia Banks wrote the following about Palin: “Honestly… Let’s find the biggest burliest blackest negroes and let them run a train on her. Film it and put it on worldstar.”

She later apologized, but denied calling for Palin to be raped, explaining that "run a train" instead just means group sex.

A rep for Twitter refused to comment on the Palin/Banks incident, saying: “We don't comment on individual accounts for privacy and security reasons.”

FOX411 asked for further elaboration on its “Abusive Behavior” policy, but did not receive a response.

Palin’s daughter Bristol doesn’t agree with Twitter’s decision to allow Banks’ to remain on Twitter.

“Twitter’s own words -- 'We believe that protection from abuse and harassment is a vital part of empowering people to freely express themselves on Twitter’,” Bristol told FOX411, quoting the social media site’s policy “I cannot imagine what they would have done if races were reversed. It's unfortunate that Twitter is not truly colorblind in this situation with regards to Miss Banks and her threats.”

A source close to the Palins told FOX411: “What is most disturbing is Twitter's failure to act when Miss Banks actively supported and encouraged her fans to seek out the Palin's personal home address, break in and inflict harm on the Palin family. Especially when it’s now been proven that Twitter was alerted to these threats on their platform and the lengthy history of deranged stalkers with violent intentions who have broken into the Palin family's properties and been arrested, charged and convicted by local and federal authorities. This is not a laughing matter and far crosses the line of freedom of speech.”

Palin said last week she would sue Banks. A source close to the Palin told FOX411 that “there are ongoing discussions with attorneys looking at all available legal options.”

 

Fox News.com Reporter and FOX411 host Diana Falzone covers celebrity news and interviews some of today's top celebrities and newsmakers.  You can follow her on Twitter @dianafalzone.