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Social Networking site Facebook is entering a staggering growth period. Inside Facebook has the details.

While Facebook has been growing at around 300,000 to 400,000 active users per day for most of the fourth quarter (based on our estimations), its growth rate seems to have significantly increased in recent weeks to 600,000 or perhaps even 700,000 new users each day.

If Facebook continues at this rate, it could add up to 20 million new users in December and reach 200 million active users by March. Keep in mind however that about 70% of that growth is happening outside the United States.

   * 13 million users update their statuses at least once each day

   * 2.5 million users become fans of Pages each day

   * 700 million photos are uploaded to the site each month

   * 4 million videos are uploaded each month

   * 15 million pieces of content (web links, news stories, blog posts, notes, photos, etc.) are shared each month

   * 2 million events created each month

   * 19 million active groups exist on the site

It will be interesting to see how FacebookConnect affects traffic. I’m running it here, you can log in and leave a comment with your Facebook account.