Table 15. Number of articles predicting education level, with associated platforms and references.

Category (n = no. articles)	Platform (n = no. articles)	References
Social Media (8)	Twitter (6)	[20,62,84,253,254,358]
	Facebook (1)	[363]
	Sina Weibo (1)	[170]
Websites (4)	NR (4)	[62,197,200,294]
Email (4)	NR (4)	[238–241]
Wi-Fi (1)	NA (1)	[250]