Blog posts are cited, and frequently indistinguishable, from news articles. See the Manual, 14.89-14.98.
Example 1 – Blog Entry
N: 1. Paul Halsall, "Who Is to Blame in the Israel Palestine Debate," English Eclectic (blog), December 21, 2009, http://englisheclectic.blogspot.ca/.
Example 2 – Blog Comment
N: 1. Richard Landes, December 21, 2009, comment on Paul Halsall, "Who Is to Blame in the Israel Palestine Debate," English Eclectic (blog), December 21, 2009, http://englisheclectic.blogspot.ca/.
Posts and comments shared on social media are usually cited in text or a note, not listed in the bibliography.
Example 3 – Facebook Post
N: 1. Justin Trudeau, "Busy first day in Vietnam. We're focused on a variety of important issues like increasing trade and promoting human rights," Facebook, November 8, 2017, https://www.facebook.com/JustinPJTrudeau/posts/10156155270170649.
Twitter content posted before the company's 2023 rebranding as X does not need to refer to the new name, though it can be added parenthetically.
Example 4 – Tweet
N: 1. NASA Webb Telescope (@NASAWebb), "👀 Sneak a peak at the deepest & sharpest infrared image of the early ever taken–all in a day's work for the Webb telescope. (Literally, capturing it took less than a day!)," Twitter (now X), July 11, 2022, https://twitter.com/NASAWebb/status/1546621080298835970.
Example 5 – Instagram Photo
N: 1. World Health Organization (@who), "Stop using antibiotics in healthy animals to prevent the spread of #AntibioticResistance," Instagram photo, November 7, 2017, https://www.instagram.com/p/BbMwkRngtip/.