Table 1.

Definition of key terms for each social media platform.

Key term			Definition
Facebook
	Reach	The number of unique individuals who viewed the listed type of #eatwellcovid19 post [52]
	Engagement	The number of actions that individuals made with the listed type of #eatwellcovid19 post, including likes, comments, shares, post clicks, etc [53]
	Impressions	The number of times the listed type of #eatwellcovid19 post entered an individual’s screen (may include more than one view from the same individual) [52]
Instagram photos
	Reach	The number of individuals who saw the listed type of #eatwellcovid19 post [54]
	Impressions	The number of times the listed type of #eatwellcovid19 post was seen (may include more than one view from the same individual) [54]
	Likes	The number of engagements that involved pressing the like button on the listed type of #eatwellcovid19 post
	Comments	The number of engagements that involved leaving a comment on the listed type of #eatwellcovid19 post
Instagram videos
	Reach	The number of individuals who saw the listed type of #eatwellcovid19 post [54]
	Likes	The number of engagements that involved pressing the like button on the listed type of #eatwellcovid19 video
	Views	The number of times the listed type of #eatwellcovid19 video was viewed
Twitter
	Impressions	The number of times the listed type of #eatwellcovid19 post entered a person’s screen (eg, timeline and search results) [55]
	Engagement	Any interactions on the listed type of #eatwellcovid19 post, including clicks, retweets, replies, likes, etc [55]
	Engagement rate	This value is calculated by Twitter and is total engagements divided by total impressions for the listed type of #eatwellcovid19 post [55]