November 21, 2007
"Forty percent of U.S. users are male, compared to 36% overall. Men looking for love may want to try Ireland or China, where 73% and 72% of users are female, respectively. Other than the U.S., which has the highest percentage of males, the lowest percentage of female users is in Saudi Arabia, Pakistan, UAE and Egypt."

Facebook Is Almost 2/3 Women (and other stats)

The US in the same club as Pakistan and a bunch of Middle Eastern countries in female usage … hmmm