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Probably would make more sense for FB.

However I'd rather see DDG become strong player on it's own gradually crippling into GOOG domination to the benefits of all.

People who use DDG would drop it the moment they would hear about FB acquiring it. I don't see the point.

FB would be the worst, because they have the most privacy issues, plus that sour deal with WhatsApp. There's no overlap of target market at all.