What was the book called that had computers implanted inside peoples heads and people could download viruses to get high?

I remember reading a book while I was in high school whose basic premise was that people had computers implanted inside their heads that were supposed to make life so much easier. They made fun of people who didn’t have the implant or have the version that isn’t implanted. I remember that teenagers would download computer viruses to get a sort of high. The government would also take data from the things you looked at to make ads more tailored to you that would flash across your vision. I know, very similar to actual life now. The protagonist meets someone who convinces them to start messing with the system by looking at a bunch of random things so they wouldn’t be able to figure out what to show them. It starts to backfire on them when the protagonists friend gets sick and they can’t get treatment because the system couldn’t get an algorithm on them. I think it was called Click, but I can’t find it. Any help is welcome!