It was inevitable that Facebook would bring in a billion friends to its social network. That means that now 1 of 7 people in the world use the site.

The milestone was acknowledged by CEO Mark Zuckerberg in an Oct. 4th blog post: “This morning, there are more than one billion people using Facebook actively each month. If you’re reading this: thank you for giving me and my little team the honor of serving you."

In Canada, more than half the total population uses Facebook - that's about 18 million people. But Brazil, India, Indonesia and Mexico join the US as the top five countries currently logging in most regularly.

Worldwide the median age of a Facebook (NASDAQ: FB) user is now 22 and more than 60 percent of users log in from a mobile device. In fact, 102 million users, just over 10 percent, only access Facebook's mobile site.

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