This isn't really a new question. Almost since the dawn of the internet people have worried about the impact it might have on our minds, memories and ability to perform tasks.
If you've somehow missed this question, have a look at
UCLA Today: "Research shows that Internet is rewiring our brains" (2014)
Academic Earth: "How the Internet is Changing Your Brain" (2013)
BBC Future: "Does the internet rewire your brain" (2012)
Psychology Today: "The Internet and the brain" (2010)
The Guardian: "How the Internet is altering your mind" (2010)
The Discovery video does, however, provide a good overview of what we know, what we suspect and what it could mean for us.
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