Facebook (NASDAQ:FB) has experienced incredible growth since it was founded in February 2004. Let's take a moment to reflect what has made the world's greatest social network so great.

By the end of 2004, Facebook had a respectable 1 million monthly active users, or MAUs, as it began expanding its reach to more colleges and universities around the U.S. With more than 1.15 billion strong today, Facebook has experienced user growth 1,154-times over that humble beginning. Simply astonishing.

Fb Maus

Source: Facebook S-1 .

In Facebook's first year of existence, the company brought in $382,000 of revenue, breaking down to $0.38 per user, a metric formally known as average revenue per user, or ARPU. ARPU is a great way to get a handle on how Facebook's revenue is trending on a per user basis because it normalizes user growth and gives insight into its ability to monetize users.

Fb Arpu

Source: SEC filings, author's calculations.

Clearly, Facebook had a bit of growing pains between 2006 and 2008 when MAUs exploded from 12 million to 145 million. Since then, it seems that Facebook worked through the kinks and has been able to scale up its marketing prowess to accommodate a much larger audience. For the first half of 2013, Facebook's APRU increased by more than 17% over the same period in 2012.

Glued to the screen
By dividing the number of daily active users, or DAUs, into the number of MAUs in a given period, investors can get a good sense if Facebook is creating a more engaged audience over time. From the investor perspective, you'll want to see this ratio growing over time since it creates more opportunities to deliver compelling ads.

Fb Dau Vs Mau

Source: SEC filings, author's calculation

In addition to converting MAUs into DAUs over time, it's also encouraging that Facebook's total share of time spent on the Internet is on the rise. According to the most recent data out from comScore, time spent on Facebook in the U.S. grew by 500-basis points to 15.8% since December 2012 . For those wondering, Facebook is ranked the No. 1 web property in the U.S. where users spend their time.

Turning threats into opportunities
As I'm sure you've heard by now, Facebook turned the threat of mobile devices cannibalizing its desktop business into a massive opportunity in just five quarters. During this time, Facebook's mobile advertising revenue grew from 3% of total advertising revenue to 41%. Not only does this speak to management's ability to react swiftly to changes in user behavior, it demonstrates the often difficult-to-measure value of its incredible "can-do" culture.

Fb Mobile Ad Revenue Vs Total

Source: SEC filings

And good thing it was able to thwart off the growing "threat" mobile...

Fb Mobile Mau Vs T Mau

Source: SEC filings

In the black
After five years of existence, Facebook turned its first annual profit in 2009, and it hasn't looked back ever since.

Fb Cumulative Net Income

Source: SEC filings, author's calculations.

On another level
When a business has a higher purpose, it often lessens management's temptation to play the game of exceeding Wall Street expectations in the short-term, liberating the organization to remain focused on fulfilling its long-term objective. Organizations that operate in this manner make decisions that are in the best interest of fulfilling their purpose, and not in the best interest of shortsighted stakeholders. In the long run, this approach can pay off handsomely for shareholders because organizations with this level of consciousness understand that fulfilling its purpose will ultimately lead to enduring prosperity.

Over the next decade, I'm confident Facebook will continue growing in ways that astound investors largely because it's a purpose-driven organization, obsessed with fulfilling its mission of giving people the power to share, making the world more open and connected. At the end of the day, Facebook will meticulously continue perfecting how users connect with one another and that'll be the ultimate driver of its business.

Here's to the next decade of purpose.

Fool contributor Steve Heller owns shares of Apple, Google, and Facebook. The Motley Fool recommends Amazon.com, Apple, Facebook, and Google. The Motley Fool owns shares of Amazon.com, Apple, Facebook, and Google. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.