Re: there is an absolute right to privacy, which there isn't
First, let's include commercial spying, aka data harvesting, in the mix. What "right to privacy" applies to NSA and GCHQ that does not apply to Facebook and Google?
It should apply to both, but equally FB/Google don't have the powers to alter your life like gov agencies do.
Next there is the POPD - Plain Old Physical Domain. What "right to privacy" does online trawling breach, that a telescope on a pier above a crowded beach does not?
That is pretty much targeted - one beach, and a given time-window when you might expect something is going to happen. The police, etc, have been doing that sort of thing for decades and most folk see it as a perfectly reasonable balance between privacy and crime prevention.
Bulk surveillance is recording every beach, all the time, and then being able to do a search at some point for where you have been. See the difference?