When Facebook introduced live video streaming, no one expected people to use the feature to broadcast brutal killings, but that's exactly what happened. From gang rapes to suicides, many suspects have taken advantage of the platform to gain a sense of instant notoriety and show off their senseless crimes to a captive, horrified audience. Footage of violent acts can sometimes sit in news feeds for hours before Facebook deletes them.

In response to all the backlash, Facebook founder Mark Zuckerberg sounded off on the issue saying, "We have a lot of work to do and we will keep doing all we can to prevent tragedies like this from happening." In May of last year, the social networking site added 3,000 moderators to help flag violent videos before they go viral, but despite their best efforts, the killings keep happening. Below, a look into nine grisly murders that took place on Facebook Live. Warning: Some of the stories/pictures are graphic.