In a second-quarter 2016 survey of on-line households, research company Parks Associates found that 50 percent of smart-doorbell owners use the devices to see who's at the door when they're not home, and 48 percent use them to see who's at the door without letting the visitor know if they're home or not.

From the article "Smart Home Goal: No Doorbell Left Behind" by Joseph Palenchar.

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