Even ignoring that, the article is just junk. It says very little, and says it poorly. :(
I guess thats what you for looking at a website that pretends a 1% sample is representative of actual Internet usage for anything beyond painting the most board strokes.
I used to bookmark anything interesting. 3 years ago my bookmarks menu wouldn't fit on the screen at once, and that was just the category folders. Later someone showed me Delicious, and I stated migrating my bookmarks there. But search engines have gotten so good, I don't even bookmark pages anymore.
Why bother tagging when searching's faster? I only have to vaguely remember what the page was about and I'm there (or somewhere better).
"Just watch, Web 3.0 will be something called Good Editing." Drew Curtis of Fark
Also, interesting to note that 'top keyword' for reddit is '4chan'.
It would be like categorizing MySpace and Yahoo Mail together because they both have messaging features.
As far as I can tell, it does all the same stuff it used to, just quicker.