&gt; Hell...there are hundreds (if not thousands) of companies just doing advertising services, alone.<p><a href="http:&#x2F;&#x2F;idlewords.com&#x2F;2015&#x2F;11&#x2F;the_advertising_bubble.htm" rel="nofollow">http:&#x2F;&#x2F;idlewords.com&#x2F;2015&#x2F;11&#x2F;the_advertising_bubble.htm</a><p>&gt; I often wonder how much of Facebook&#x27;s revenue (for example) consists of valley startups trying to micro-target indifferent consumers.<p>During the dot-com boom, a large fraction of Yahoo&#x27;s revenue was coming from startups, who were using their VC money to pay exorbitant amounts for partnerships with Yahoo. You can guess what happened at Yahoo when the party ended in 2000 and the money men went back to NYC.