Note: Nielsen Online, AdRelevance service uses a proprietary methodology for estimating online advertising expenditures and only takes into account image-based technologies and advertising sold per CPM. Data does not reflect house advertising activity, strategic partnerships between publishers and advertisers, or text units, compound image/text ads, paid search, sponsorships, email, units contained within applications (e.g., messengers and pre-rolls) or performance based advertising.

Youth Don’t Think Ads on TV Are That Effective, Regardless of Linear or Streaming
Email is considered the most effective overall, ahead of ads on live TV, streamed shows, and direct mail.