The problem is that evolution generally occurs at a relatively slow pace unlike the explosive rate at which technology and its byproducts (e.g. social media/texting, internet, etc) have evolved. I don't think we're keeping up.
As a software developer/analyst who has been exposed to the internet for about 22 years (starting with BBSes and Trumpet WinSOCK), I've recently noticed a slight decrease in my ability to process information as I attempt to keep pace with an ever changing industry. I attribute this to information overload as I find myself constantly bouncing between web pages, checking email, catching up on tech blogs, etc.
I abhor social media sites like Facebook and Twitter, generally avoiding them like the plague, but the constant multitasking required by my daily grind is definitely having an effect on how I process and retain information. Honestly, due to the sheer volume of information that I have to read, I continually catch myself skipping paragraphs in articles, probably in a subconcious and futile attempt to maximize my time. I also find that I'm more easily distracted by related links in tech/coding articles, which link to even more information. This obviously doesn't always yield the best results and I never used to be this way.
As someone mentioned below, two or three weeks of vacation, including reduced or at least more focused use of the internet, has my mind feeling sharper and better able to process and retain what I'm reading.
While I'm not one to be an alarmist, both my wife and I have agreed to strictly limit our young daughter's exposure to TV and computers. She will also never have a smart phone with texting capabilities; I see too many kids walking around like zombies with their eyes glued to their phones as they traverse busy intersections without nary a concern for cars or other pedestrians. There is no need for that sort of constant connectivity to friends and media.
The internet is a vast source of information but as the article states, I think we're starting to see some of the potential side-effects of always being plugged into and bombarded by information.