This has been on my mind a lot recently. Zeynep Tufekci explains the problem in a much clearer way than I ever could.
This sounds like something out of a tin foil hat conspiracy but seems, sadly, to be all too real.
You can’t see the gross stuff on the airport floor, but you wouldn’t walk there barefoot.
Ad blockers have been in headlines a lot recently due to Apple's introduction of that functionality to their latest mobile operating system. Advertisers and publishers are not happy with this loss of revenue; users are not happy being tracked across the web.
