Mark Zuckerberg’s fortune suffered a $3.99B loss after he posted on Facebook about how the social network would be changing its news feed to cater to interactions between friends and family rather than content from publishers and brands. The change is expected to reduce the time that people spend on the site. For much of the past few months, Zuckerberg has been thinking aloud about Facebook's mission, saying he wanted Facebook to become a place for meaningful social interaction. His resolution for 2018 was to "fix" Facebook, according to the South China Morning Post. Zuckerberg said in the post yesterday that he wanted to change the way Facebook ranks posts by putting more weight on social interactions and relationships.