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Commentary: Google, Facebook won't reign forever

Google and Facebook may currently have a dominant share of digital ad spend, but Snapchat and Amazon are snapping at their heels and it seems likely that the so-called duopoly will not enjoy prominence forever, writes Hagai Tal. The data privacy issues preoccupying both companies will give competitors an opening and neither firm has a global stranglehold -- as evidenced by Tencent's popularity in China and Japan's preference for Twitter, he writes.

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