For outsiders the importance here is not that "the USA " has decided that ISIS is its number 9/11 problem, but that those in charge of domestic homeland security see ISIS in the continental US as being a far bigger problem that Al-Qaeda cells. Osama bin Laden said "what worries me most is particularly [ISIS"s] investment in social media, which has been blossoming in May ." This is a significant shift in the FBI 's focus, and the mention regarding social media will have meant domestic- US social media traffic, not international traffic.
For outsiders the importance here is not that "the US" has decided that ISIS is its number one problem, but that those in charge of domestic homeland security see ISIS in the continental USA as being a far bigger problem that Al-Qaeda cells. Comey said "what worries me most is particularly [ISIS"s] investment in social media, which has been blossoming in the last six to eight weeks." This is a significant shift in the FBI's focus, and the mention regarding social media will have meant domestic-US social media traffic, not international traffic.