"The law currently exempts online platforms such as Facebook for most content its users post, but Danielle Citron, a law professor at the University of Maryland who testified, said the immunity should be preserved only for those that employ "reasonable content moderation practices."
"There are some sites that literally traffic in abuse, that encourage illegality, but they should not enjoy immunity from liability," Citron said, adding that she has advised Facebook and Twitter Inc. as best practices have emerged in recent years."