Too many ads on mobile applications, good apps are losing its value

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Hi, I use the new note 8, but do not understand why, every time the machine is surfing the Internet is often displayed in front of the screen, every time the machine is finished opening up the ad is back, Even when many FB surfing the billboard also displayed, I have searched for ways that do not see any items off the ad, which doctors have this case yet? Now how to turn it off?