Additional Note: Digital ad spending includes banner ads and other (static display ads such as Facebook's Feed Ads and X's Promoted Posts), classified ads, email (embedded ads only), mobile messaging (SMS, MMS, and P2P messaging), rich media (including in-stream and outstream video ads), search ads (including contextual text links, paid inclusion, and paid listings, and excluding display-oriented formats on social networks, even if triggered by search queries), sponsorships, lead generation (referrals); rich media data for 2017-2022 includes in-stream and outstream video ads; data prior to 2017 includes only outstream video ads.