Just read the website.
By James W Sarvey
All of the interesting stats are already on the OkCupid blog. Most of the book is preachy, making accusations of racism against pretty much everyone. The author is careful not to miss an opportunity to remind the reader that his wife is Indian, so he's exempt from this critique. The main takeaway is that if you're attracted to white people, you're morally inferior to the author and you should feel bad, no matter what race you are.
If you're looking for a social commentary with conclusion-jumping and moral crusades, this is it, I guess. If you want more of what was on their blog, like lots of fun and thought-provoking statistics, look elsewhere.