Facebook, Microsoft, Twitter, and YouTube are coming together to help curb the spread of terrorist content online. There is no place for content that promotes terrorism on our hosted consumer services. When alerted, we take swift action against this kind of content in accordance with our respective policies.

Starting today, we commit to the creation of a shared industry database of “hashes” — unique digital “fingerprints” — for violent terrorist imagery or terrorist recruitment videos or images that we have removed from our services. By sharing this information with each other, we may use the shared hashes to help identify potential terrorist content on our respective hosted consumer platforms. We hope this collaboration will lead to greater efficiency as we continue to enforce our policies to help curb the pressing global issue of terrorist content online.

Our companies will begin sharing hashes of the most extreme and egregious terrorist images and videos we have removed from our services — content most likely to violate all of our respective companies’ content policies. Participating companies can add hashes of terrorist images or videos that are identified on one of our platforms to the database. Other participating companies can then use those hashes to identify such content on their services, review against their respective policies and definitions, and remove matching content as appropriate.

https://blog.twitter.com/2016/partnering-to-help-curb-the-spread-of-terrorist-content-online

Well, nothing in the tech restrict it to "terrorist content", actually companies could almost instantly wipe out any video or image they won't like.