Several user-generated Facebook pages that promoted violence against George Zimmerman, the Florida man found not guilty in the shooting death of black teenager Trayvon Martin, have been pulled offline this week, but others remain intact, reigniting a debate over how Facebook should handle offensive content.

So far, pages titled “Kill Zimmerman” and “Let’s Kill George Zimmerman” have been removed, but “George Zimmerman must DIE” remained live(Opens in a new window) as of Tuesday afternoon, as did a page called “Kill George Zimmerman.”(Opens in a new window)

Other similarly themed pages were also still in existence despite requests from some Facebook users to remove them, Examiner.com reported(Opens in a new window).

One Facebook user who requested that the “Kill George Zimmerman” page be taken down reported that the company responded by saying the page in question did not violate its community standards(Opens in a new window) and would therefore would not be taken down.

In a notification sent to that user, pictured below, Facebook stated that it had “reviewed the page you reported for containing credible threat of violence and found that it doesn’t violate our community standard on credible threat of violence.”

Facebook declined to comment on the specific pages, but pointed to its community guidelines. Under a section titled “Violence and Threats,” Facebook states:

“Safety is Facebook’s top priority. We remove content and may escalate to law enforcement when we perceive a genuine risk of physical harm, or a direct threat to public safety. You may not credibly threaten others, or organize acts of real-world violence. Organizations with a record of terrorist or violent criminal activity are not allowed to maintain a presence on our site. We also prohibit promoting, planning or celebrating any of your actions if they have, or could, result in financial harm to others, including theft and vandalism.”

Another portion of the community standards document forbids “abusive behavior directed at private individuals,” though it’s debatable whether Zimmerman is still private individual vs. public figure at this point.

In May, Facebook pledged to review its policies on hate speech, in particular to review the guidelines it currently has in place for removing offensive content, and hold those who create the content more accountable.

Last Friday, a Florida jury found Zimmerman not guilty of second-degree murder and manslaughter charges following Martin’s death in a gated community in Sanford, Fla. on the night of Feb. 26, 2012.

Zimmerman shot and killed Martin during what Zimmerman said was a physical altercation initiated by Martin, who was staying in a townhouse in the gated community and was walking on the street after purchasing some items at a nearby store. While Zimmerman successfully claimed self defense in the incident, prosecutors argued that he was culpable for Martin’s death, claiming he profiled Martin on racial grounds and assumed the teen was planning criminal activity, followed Martin in a harassing manner, left his vehicle against the advice of a 911 dispatcher, and ultimately initiated the physical altercation that led to Martin’s shooting death.

The case gained national attention, becoming in many people’s eyes a referendum on race, racial profiling and the dangers faced by young black males, gun laws, and Florida’s controversial “Stand Your Ground” law, which ultimately was not directly cited in Zimmerman’s trial. Following the not-guilty verdict, thousands took to the streets in several cities for what were largely peaceful demonstrations to protest Zimmerman’s acquittal.

The Internet, however, has proven to be a more incendiary place in the wake of the controversial jury verdict, with frustration, anger, racially charged rhetoric, and even calls for violence airing out on social networks like Facebook and Twitter, as well as other online forums.