From the Crossway blog (ironically!)
If we fill our lives with fragments of information, our brains will adapt and our concentration will weaken. We will begin to find articles, chapters, and books increasingly demanding as our attention spans shrivel. Eventually we will find it difficult to stroll through long stretches of prose. Book readers must work to sharpen their attention. Like marathon runners who train daily to stretch their endurance, book readers must discipline themselves to read one book for thirty to sixty or ninety minutes at a time, struggling to increase their mental concentration.
Reacting vs. Thinking
Traditionally, a reader selected one book and sat alone in a reading chair. When great ideas were encountered, the reader internalized those ideas and reflected on them. If the reader encountered points of disagreement, the reader also stopped to reflect on what made the point disagreeable. Traditional readers engaged with a book and engaged their thinking.
This has changed with online social interaction. Now, when we come across an idea that we like, we are tempted to quickly react, to share the idea with friends in an e-mail, on Facebook, or on a blog. When we disagree, our initial response is to ask for the input of others. With online access to so many friends, the temptation is to react, not to ponder. Acting upon what we’ve just read, rather than stopping to meditate and think, is an impulse that we bring to reading books. I am quick to Tweet and slow to think. I am quick to Google and slow to ponder.So ask yourself the next time you read: When you come across a provoking or perplexing portion of a book, what are you more likely to do: react or think? When you are tempted to react, stop, and simply think and meditate about what you are reading.
Four Temptations: How Internet Habits Can Cripple Book Reading | Crossway.