here's one cyber expert. this looks. like a mistake that came from within facehook— like a mistake that came from within facebook themselves, so inevitably, the question of cybersecurity comes up. the question of cybersecurity comes up but— the question of cybersecurity comes up but im — the question of cybersecurity comes up. but i'm confident that this may have been— up. but i'm confident that this may have been an accident. the engineering _ have been an accident. the engineering team - have been an accident. tie: engineering team offered have been an accident. tte: engineering team offered a have been an accident. t'te: engineering team offered a technical explanation of what happened. it says... in other words, one of its tools had a bug. that meant the wider internet couldn't see facebook's services. here's another cybersecurity expert. this is a wake—up call for us all. we depend _ this is a wake—up call for us all. we depend on _ this is a wake—up call for us all. we depend on the _ this is a wake—up call for us all. we depend on the internet i this is a wake—up call for us all. we depend on the internet so i this is a wake—up call for us all. i we depend on the internet so much, but there _ we depend on the internet so much, but there are — we depend on the internet so much, but there are these _ we depend on the internet so much, but there are these ridiculous - but there are these ridiculous protocols _ but there are these ridiculous protocols that _ but there are these ridiculous protocols that were _ but there are these ridiculous protocols that were never- but there are these ridiculous i protocols that were never designed to support — protocols that were never designed to support the _ protocols that were never designed to support the sorts _ protocols that were never designed to support the sorts of— protocols that were never designed to support the sorts of things i protocols that were never designed to support the sorts of things that. to support the sorts of things that the criticality— to support the sorts of things that the criticality of _ to support the sorts of things that the criticality of the _ to support the sorts of things that the criticality of the internet i the criticality of the internet makes — the criticality of the internet makes clear. _ the criticality of the internet makes clear. that's - the criticality of the internet makes clear. that's not i the criticality of the internet - makes clear. that's not something facehook— makes clear. that's not something facebook hy— makes clear. that's not something facebook by itself _ makes clear. that's not something facebook by itself can _ makes clear. that's not something facebook by itself can revisit. i makes clear. that's not something facebook by itself can revisit. this| facebook by itself can revisit. this threw u- facebook by itself can revisit. this threw up a — facebook by itself can revisit. this threw up a lot _ facebook by itself can revisit. this threw up a lot of _ facebook by itself can revisit. threw up a lot of issues. facebook by itself can revisit.- threw up a lot of issues. facebook makes the bull of its revenue from adverts. that would have hurt its businesses, although there will be a