what she calls the safe space for islamist extremism, and doing that through cyberspace. we've heard authorities talk about cracking down or getting twitter and facebook to crack down. what's -- how realistic is that, from your counter-terror expertise, and what would be the value? >> you know, i was online back in 2012, even 2013, when isis first came into syria. we were tracking isis foreign fighters for three years straight almost every day online engaging with them. it's a two-sided coin. if you block accounts, then you lose the ability to track them. you don't know who they're connecting with. you don't know what they're saying and who they're saying it with. if people want to keep believing telegram is still encrypted or other services are still encrypted, let's let them keep thinking that and we'll keep monitoring and intercepting