I've known that for a long time.
At my last job I'd get people coming to me thinking I'm "the guru" asking "how do I do 'X'?"
I ask "did you Google it?" and they'd say "yes, but I didn't find the answer"...
I'd go to Google and literally type in the search box "how do I do 'X'", exactly what they asked, and get 50,000 results, click on the first couple links and find the one I think explains it best and print it out for them.
...a few months later they'd be back with the exact same question.
I remember one guy coming to me with a question/problem, I literally walked him through what he needed to do from memory. He asks "how do you know all this?", I said I had the same problem 3 years earlier and it took me like 2 hours of digging to figure out how to do it.
He says back "how do you remember what you did 3 years ago? I can barely remember what I did last week."
Honestly, most people are not only clueless but I'm convinced the iPhone/social media thing has made people's memories and attention spans non-existent.