> The required data covers only the domain name of each site visited - www.facebook.com or www.bbc.com, for example - not the individual pages within them.

So this article was the first time I learned the law only requires host logging. But now I'm even more confused...how does the UK Gov argue that logging your access of facebook.com, but not what you do in facebook.com, will help fight terrorism? Like, are terrorists going to isisrecruiting.com? I would've thought they would just use subportions of more popular and general hosts.