The Evolution of Advertising in 5 Minutes
by Tom Carroll
Kevin Rose interviews Chris Sacca of lower case capital and Chris gives a great interview. I recommend you watch the whole thing. But, to hear the best explanation of how advertising has evolved and why services like Twitter, Foursquare and Square are so valuable. The explanation starts at 34 Min.
If you like this interview you might also like Chris Sacca on This Week in Start-ups