Visit this link:
http://www.huffingtonpost.com/tony-schwartz/self-help-the-death-of-de_b_595720.html
Good article on attention spans and what's affecting them.
As any experienced meditator knows, the mind has a mind of its own. Left free to wander, that's just what it will do. When we manage the infinite demands on our attention by trying to juggle them all, we literally weaken our capacity for absorbed focus.