Testing platform Optimizely has added an ability to integrate external behavioral data, giving users a more complete view of test impacts. The new feature tracks the tests received by each individual and then ingests data from other systems about their behaviors. This breezily assumes that your other systems can give Optimizely a personal identifier to tie everything together. Easier said than done.

But don’t abandon mobile just yet. When you take non-video ads into account, it’s still king: eMarketer reports mobile will account for $87 billion in U.S. media spend this year. That’s two-thirds of all digital advertising and just over one-third of the entire total ($238 billion). eMarketer pegs non-digital TV at just $71 billion.

YouTube is not just a video platform, of course, it’s also a powerful search engine and it has begun testing a Google AI Overviews carousel that will appear in results for selected queries. Given the threat AI Overviews is perceived to pose to click-thru traffic in Google Search results, there’s a question about whether the YouTube initiative could depress click-thrus to brand and creator videos. Right now, the feature is only visible to a sub-set of U.S. premium users.