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People spend most of their time on Facebook products, especially on mobile - for example, in HK's public transits, it is not uncommon if you find over 70% of people near you are actually using Facebook products at the same time (FB/WhatsApp/Instagram)

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I reckon if Facebook would add search to WhatsApp, it could hurt Google's ad income quite a bit.

Right now you have to close WhatsApp to start a search. And then come back when you have found the answer.

There is potential for Facebook for smooth search integration in its products and take bigger piece of the search-ad pie.

Now on Tap does that for pretty much any application though, if you've got Marshmallow.

That's the thing though, how many android phones are on mashmellow? A very small percentage.

Start a search and use whose API? Google has tens of thousands of people working on a top 5 difficulty problem with a 20 year head start. Facebook would need at least 10 years of trial and error just to make a dent.

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