Television and radio are broadcast mediums. Facebook is a different medium altogether and not an apt comparison IMO, since all individuals produce the content... it's a sort of "democratized broadcast content".

Facebook can and is taking responsibility over policing this content to some extent but you have to realize the two extremes the whole enterprise has to flirt with: (1) respect individual liberties but allow for the full spectrum of negative human behavior, or (2) try to play god and create a global set of moral conduct and use it to silence and thought-police those that don't comply.

I hope you can see the trickiness here and that there is no utopian panacea to easily solve this issue.