News from a few years ago, but another example of how FB has been shaping society:

1 in 3 divorces start as online affairs.

Facebook is increasingly being blamed as a reason for, or as evidence when, filing for divorce. In 2011, 33 percent of [UK divorce] petitions contained the name of the social network [Facebook]

Back in December 2009, Facebook was blamed for 20 percent of divorces in the US.

https://www.zdnet.com/article/facebook-blamed-for-a-third-of-divorces-in-the-uk

https://www.mckinleyirvin.com/family-law-blog/2015/august/surprising-stats-on-social-media-divorce-infogra/