It took Facebook less than a decade to accumulate over 1 billion users.

Facebook, the world's largest social playground with over a billion participants and growing, celebrates its 9th birthday today. It was on February 4, 2004 that Mark Zuckerberg and his partners launched "Thefacebook," the original name of the Harvard-only service before Zuckerberg droped the "The" from the title at the recommendation of Justin Timberlake Sean Parker, or at least that's how it was portrayed in the docu-drama The Social Network.

A million members isn't cool. Do you know what's cool? A billion members. Yes, we're semi-quoting from the movie The Social Network, in which Justin Timberlake, playing the part of Napster founder Sean Parker, talks about scaling to a billion dollars. Facebook's been there and done that, and now it can add to its list of achievements that it's now home to more than one billion people actively using the social networking service each and every month.

For all the hype leading up to Facebook's Initial Public Offering (IPO) in May of this year, it's somewhat hard to believe the social networking site is performing so poorly in the stock market. It's not shocking that Facebook hasn't lived up to all those inflated valuations that came courtesy of hefty private investments before being traded on the public market, but would you have guessed it would become the second worst performing IPO post share lock-up? Let us explain if you don't know what that means.

Facebook co-founder Mark Zuckerberg tied the knot over the weekend, marrying his sweetheart of more than 9 years, and hopefully his marriage doesn't sputter the way Facebook's initial public offering (IPO) has. On just its second day of trading, the world's largest social playground saw its shares dip below its IPO price of $38 on Monday, a bad sign for those who thought pouring a ton of money into Facebook at the outset would lead to easy riches.