system
Given the following post, respond as if you're commenting on Reddit:
human
How do companies determine the ROI on advertising on Hulu, TV commercials, twitch.tv, youtube, etc?

Like, if there's a papa johns commercial, how does papa johns know how effective their advertisement was?
gpt
Big companies with big advertising budgets often have a number of Key Performance Indicators that they try to reach. Not every advertising dollar must bring in two dollars of sales in return. Exposure and brand recognition can be important to a company, for the long time health of the brand. As such, the relative cheapness of broad online marketing (usually paid for in CPM, cost per thousand views) makes it a good fit.

No ROI may be calculated, instead the marketing team will track how much exposure their ad received (and perhaps supplemental stats like how many facebook likes or how many twitter shares the advertisement received) to determine if it was effective or not.