As with xkcd itself, the beauty of the book is the depth of thought and extrapolation
beyond the facile that goes in to answering such questions as «what would happen if everybody on earth jumped at the same time» or «what would happen if a baseball pitcher threw the ball at 9/10 the speed of light»?
You will have to extend your reach
beyond your immediate social network to reach new readers, but you will be more comfortable doing that if you have an online presence and are
facile in using online tools.