Additional Note: Social networks are sites where the primary activities involve creating a profile and interacting with a network of contacts by sharing updates, comments, photos, or other content. Social network users are individuals of any age who use a social network via any device at least once per month.
Methodology: Estimates are based on the analysis of various elements related to the ad spending market, including macro-level economic conditions, historical trends of the advertising market, historical trends of each medium in relation to other media, reported revenues from major ad publishers, estimates from other research firms, data from benchmark sources, consumer media consumption trends, consumer device usage trends, and eMarketer interviews with executives at ad agencies, brands, media publishers, and other industry leaders.