There is no advertising bubble. I used to think there was one but this article convinced me otherwise:<p><a href="http:&#x2F;&#x2F;www.bloomberg.com&#x2F;bw&#x2F;articles&#x2F;2014-03-03&#x2F;advertisings-century-of-flat-line-growth" rel="nofollow">http:&#x2F;&#x2F;www.bloomberg.com&#x2F;bw&#x2F;articles&#x2F;2014-03-03&#x2F;advertisings...</a><p>What may exist (maybe that&#x27;s over as well) is an advertising startup bubble.