The thing is people think browsing history is just the sites they visit by clicking on links, it's a lot more
Go to any newspaper site and look at the HTML for the page, there are scripts pulled in from dozens of sites & media from dozens more, most people don't know this happens.
All a terrorist group has to do is attack one of the scripting sites & modify a script so it downloads content from a known terrorist site into a dynamically created div element with a style of "display:none" so you never see it, leave it for a few weeks & then remove the modification. Your ICR log now has dozens of accesses to terrorist sites that you know nothing about but that are freely available to the authorities without a warrant, should they ever decide to go on a fishing expedition.
The first time I mentioned this the BBC were serving some third party adverts that were infected with malware, so the mechanism is in use already just with a different payload, and no antivirus or antimalware in the world will spot this attack as it's not trying to infect your machine, it's trying to add incriminating entries to your web log held by your ISP.
The first you'll know about this is when the police drag you from your bed at 4am
Biting the hand that feeds IT
