1. Social-media platforms are destroying evidence of war crimes
The ICC is trying to arrest a warlord in Libya, but they can't find him. The warlord is a murderer and he is posting videos of his crimes on Facebook. The ICC doesn't know if the videos are real, or if the warlord is really who he says he is. So the ICC can't arrest him until they get more information.
The article is saying that social media platforms are removing evidence of war crimes from their websites.