Latest traffic data from ComScore indicates that Facebook will probably pass the 500 million users milestone sometime soon, possibly in the next month. ComScore is currently reporting that Facebook serves 484 million unique users, with 22 million new users added in the month of February. If Facebook continues acquiring new users at a comparable rate, it will probably have over 500 million unique users by the end of April or May.
It is worth noting that ComScore's user stats for Facebook are usually higher than the figures Facebook is willing to report itself. Facebook did not official report that it had amassed over 400 million users until February of this year, even though ComScore reports showed Facebook over that threshold months earlier. At the f8 conference this week, Facebook did not announce that the network had surpassed 450 million users, suggesting the gap between its stats and ComScore's reporting is still wide.
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