From eMarketer:
This year, for the first time, more than half of the US population will use Facebook, according to eMarketer’s latest social network usage forecast. In 2016, 50.3% of Americans of all ages will be on Facebook at least once a month, up from 49.3% in 2015.
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Source: eMarketer (Feb. 25, 2016)
Another important milestone for Facebook this year is that more than half of US mobile phone users will be Facebook users. In 2016, 52.9% of mobile phone users will log on to Facebook at least once a month from their mobile phone. And mobile will continue to play an important role in Facebook”s growth. This year, 86.0% of US Facebook users will access the platform through a phone, with that figure climbing to 91.0% by 2019. Strong user engagement on mobile is helping to drive Facebook’s mobile ad revenues, which this year will amount to 19.2% of total mobile ad spending in the US (Google is No. 1 with a 31.7% share).
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See Also: More Than a Third of Mobile Phone Users Will Be on Instagram in 2016 (via eMarketer)