slippery slope even though might reduce isis traffic twitter freedom speech challenge waaaay much days yet another example twitter clarify definition abusive behavior prompt delete account ban hateful conduct promote violence specific groups.the social media company disclose change tuesday blog post follow rise criticism enough thwart islamic state use site propaganda recruitment always embrace encourage diverse opinions beliefs continue take action account cross line abuse megan cristina director trust safety say blog.the new rule mention islamic state group name.read nyp slippery slope new twitter rule ban hateful conduct promote violence