"Posts and comments shared on social media are usually mentioned or cited in the text or in a note...Because such content is typically brief and often informal, it is not usually listed in a biblography." (Chicago Manual of Style, 18th ed., 14.106).
"Citations in the notes should include enough text from the original post to identify it (up to 280 charachters, including spaces, and retaining andy emojis)" (Chicago Manual of Style, 18th ed., 14.106).
18. Roxane Gay (@rgay), "The bags under my eyes are quite roomy," X (formerly known as Twitter), June 17, 2018, 3:59 p.m., https://twitter.com/rgay/status/1008484262763483136.
19. Chicago Manual of Style (@ChicagoManual), "Is the world ready for singular they? We thought so back in 1993," Facebook, April 17, 2015, https://www.facebook.com/ChicagoManual/posts/10152906193679151.
20. Pete Souza (@petesouza), "9/11 anniversaries from the past," series of seven Instagram photos, September 11, 2022, https://www.instagram.com/p/CiXj$5junw6