I recently reinstalled my system and didn't immediately install any AdBlock software, so for the first time in many years, I actually saw ads (that I noticed).

I recently reinstalled my system and didn't immediately install any AdBlock software, so for the first time in many years, I actually saw ads (that I noticed). I was surprised how relevant the ads actually were. They very clearly had an idea about what I had been researching the last couple of days. I think this is probably a good thing, if ads are supposed to be a necessary evil.