Facebook Experienced a Big First This Week 1B people used the site on the same day By Newser Editors and Wire Services Posted Aug 27, 2015 3:54 PM CDT 20 comments Comments This May 16, 2012, file photo shows a Facebook logo displayed on the screen of an iPad in New York. (AP Photo/James H. Collins, File) (Newser) – For the first time, a billion people used Facebook in a single day on Monday. CEO Mark Zuckerberg marked the occasion with a post on his Facebook page, saying that one out of seven people on Earth logged in to the social network to connect with their friends and family. The 1 billion figure is different from the daily user numbers Facebook discloses each quarter when it reports its financial results. Those are the average number of daily users, counted over a 30-day period. Facebook had 968 million daily active users in June. Overall, Facebook has nearly 1.5 billion users who log in at least once a month. It hit the 1 billion user milestone in October 2012.