Brand advertising can offer higher ROI for some verticals: According to new research from Facebook, ecommerce and retail verticals may find upper-funnel ads more cost-effective than direct-response advertising—so, some marketers may need to reevaluate their strategies.

Major changes are coming to how advertisers and others in the ecosystem can identify users across channels and devices. The loss of third-party cookies and changes to Apple’s Identifier for Advertisers (IDFA)—rumored to roll out this month—will affect ad addressability, but also measurement and attribution. Advertisers are taking steps in response, including more emphasis on first-party data, data collaborations, and modeling-based approaches.