To be made up of:
Author.
Year that the posted message was published or last updated (in round brackets).
Title of page (in italics) (unless it is the same as the author).
Day/month of posted message.
Available at: URL.
(Accessed: date).
In-text citation:
(UCL, 2021)
Reference list:
UCL (2021) 31 March. Available at: https://www.facebook.com/uclofficial. (Accessed: 14 April 2021).