The report was based on June 2017 comScore measurement data.
Google-owned sites, including YouTube and other platforms, were the most-visited Web properties by US consumers in June (241 million unique visitors across mobile devices and desktop computers, combined).
Facebook was the next most-visited Web property (204 million unique visitors).
Facebook's app was the most popular with US adults in June (76% reach among people age 18+); YouTube ranked second (67%).
Facebook Messenger was third (65%), followed by Google Search (60%) and Google Maps (56%).
About the research: The report was based on June 2017 comScore measurement data.