Facebook have added 23 million new users in the last month to bring their audience to almost 375 million users. This grand total isn’t comprised of people who merely sign up for an account and never come back. This number represents the amount of people who visit Facebook at least once per month. It appears that Facebook has reached critical mass and is finally getting traction in regions where competing social networks got to market first. Brazil and Europe both have solid competitors due to language barriers and the sheer size of their populations. It seems that Facebook’s translations application has served them well as they continue to go from strength to strength.
Here’s a good analysis in a post from Inside Facebook.

