A story in the Wall Street Journal, "Radio Tunes Out Google in Rare Miss for Web Titan," detailed Google's struggles in making in-roads into the radio ad market. In short, Google faced formidable barriers to entry, ranging from an entrenched ecosystem dominated by a few large radio station networks, a few media buying agencies, and advertisors demanding accountability.

Why Google's One-Trick Pony Struggles to Learn New Tricks
[blogs.harvardbusiness.org]

[edited by: engine at 2:38 pm (utc) on May 13, 2009]
[edit reason] formatting [/edit]