When Google bought YouTube for $1.5 billion, more than a few people thought the search engine was insane to pay that high a price. Judging from these numbers, it turned out to be a wiser acquisition than the naysayers predicted at the time.
At this point in Internet history, the attractiveness of sites based upon shared user feedback is beyond disputation. Just take a gander at the stats in this snapshot -- confirming what has been a years-long trend.
And it's not just old-line operations like the U.S. Post Office that are scrambling to coexist in a new world. The same applies to old-line tech companies struggling to meet the challenge posed by iOS and Android.