If you've been online lately, chances are you've seen Isaiah Mustafa, the new face of Old Spice. Mustafa's "The Man Your Man Could Smell Like" videos have made the company's YouTube channel the third most subscribed of all time, with 106 million views and counting.

Old Spice’s viral video campaign has garnered more views than President Obama's victory speech and Susan Boyle's "I Dreamed a Dream" audition, which says something about both the company's marketing savvy and the growth of online video. In 2007, U.S. Internet users watched an average of 9 billion videos online each month. Today, the monthly average has skyrocketed to 34 billion videos.

And it's not all entertainment. Everyone from teachers to government leaders to healthcare professionals has adopted online video as a way to deliver fast, consistent and engaging information. It's a force powerful enough to educate millions - or transform a cologne you associate with your grandfather to the most talked about product in Internet history.