Puzzle me this....

Why do people walk and read at the same time? Is it a Victoria thing? I was crossing the street to catch my connecting bus and a girl, probably early 20s, walked by, head in a book. Is the book that gripping that she literally could not put it down? Is she anti-social and does not want to make eye contact? Are you REALLY able to concentrate on what you are reading as you walk by traffic, fellow pedestrians, small children haphazardly navigating their bikes? I should ask someone one day....if I can get their attention.