video, that's where hashing comes in. facebook told us yesterday that every version of the video that they could find on the platform, they were pulling into a database of where they said it would help them find other versions of the video. and so, hashing -- what hashing basically does, it helps prevent other versions of the video. and from being able to be uploaded on the platform. the problem with hashing, however, is that if there are changes made to the video, even slight, sometimes, the systems can miss it. it's problematic. it's challenging. but i mean if these billion dollar companies, some of the richest companies in the world, in silicon valley can solve this problem, i don't know who can. >> donnie owe y'sullivao'sullive to have you here. thank you. >> if you at home want information, i know a lot of people do, on how to help the victims in new zealand, you can go to cnn.com/impact.