246 Trillion people
Just a brief snippet of The Grand Design was released to generate buzz and considering that the number of people apparently sharing this article is 6 orders of magnitude larger than the number of people on earth, I’d say it worked.
The comment thread is also pretty entertaining – people (probably with no more astrophysics knowledge than your average 5th grader) claiming that his data is misleading, his reasoning flawed, his conclusions erroneous, and he’s probably a bad person to boot. And they conclude all of this based on a report about 2 pages of a book that isn’t even released yet. This post sums it up pretty nicely.