Its a fair point. However, I don’t think it has reduced our capacity for thinking, it’s simply allowed us to think more about stuff that others haven’t, which is pretty awesome. We’re building a shared corpus of understanding as a species that we never had before, which seems exciting. Most of my friends verify things on Wikipedia or the internet before giving an answer to a question; basic fact checking allows making informed decisions which perhaps have a higher likelihood of success. Well maybe not but the success or failure would both be worthwhile since the reason it failed couldn’t just be that it was based on a lie.