The top-10 companies as ranked according to Advertising Age's annual listing of the 100 leading media firms haven't changed from last year, but a look deeper into the list reveals a shifting media landscape. Rishad Tobaccowala said: "If you look back 20, 30 years ago, the major companies would probably be print-based. Then they move to basically be broadcast based. Now we're looking at companies that have basically digital or technology underpinnings."

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