Tracking terrorists online might invade your privacy

By Peter Ray Allison 9th August 2017 in BBC.com 

The Investigatory Powers Act replaced parts of the Regulation of Investigatory Powers Act 2000 and
expanded the surveillance powers to include all forms of communications. “It is legislating their existing powers so they could be regulated and there could be some  oversight of what they are doing,” says Monica Horten, a  visiting fellow for the London School of Economics.

This record of online behaviour provides telling information of who the subject is and  what they do. Repeated visits to the NHS website would indicate a person with  medical concerns, whilst visiting a particular bank indicates where they keep their  money. “The amount of data they are collecting is quite a lot and the picture they  can build up using the metadata is quite significant,” says Horten. “They can build up a picture of you and your lifestyle.”