It didn't take long, and the speaker was David Cameron:
"Mr Speaker, everyone watching these horrific actions will be stuck by how they were organised via social media.Text via. Image source.
Free flow of information can be used for good. But it can also be used for ill. And when people are using social media for violence we need to stop them.
So we are working with the Police, the intelligence services and industry to look at whether it would be right to stop people communicating via these websites and services when we know they are plotting violence, disorder and criminality."