Tucker Carlson is already getting lots of Twitter views, but that’s not the same as TV ratings

When Fox News and its top-rated personality parted ways last month, it was immediately unclear what either planned to do next. Fox News subsequently saw its viewer numbers drop nearly in half during Tucker Carlson’s former time slot—from an average of more than 3 million to an average of around 1.65 million, according to reporting from the Washington Post. Carlson, meanwhile, went radio-silent for a while, likely calculating his next move.

On Tuesday, he emerged, however, announcing in a nearly three-minute video on Twitter that he would be starting a new show on the social media platform. While the New York Times reports that Carlson is still, in fact, under contract at Fox News, it’s clear that Carlson is ready to take his show to the internet—and his audience with him.

But how much of his audience will follow?

As of Wednesday afternoon, Carlson’s video had been viewed more than 21.3 million times—something that did not go unnoticed by other Twitter users. One tweeted in response to Carlson’s video that not even a half-hour after the announcement, Carlson had more viewers for the clip than the entire Fox News primetime lineup would get that night.

That may or may not have been true, though it is clear that other Fox News personalities don’t have the magnetism that Carlson’s show did. As for whether Carlson’s prospective Twitter show will be able to go toe-to-toe with Fox’s primetime lineup (or CNN’s or MSNBC’s, for that matter), it will largely come down to the tricky business of how audiences are measured. While audience measurement has never been an exact science, there are some key differences between how Twitter accounts for a “view” and how TV ratings are calculated.

Here’s a quick breakdown:

Twitter tweet views: Per Twitter’s Help Center, “anyone who is logged into Twitter who views a Tweet counts as a view, regardless of where they see the Tweet (e.g. Home, Search, Profiles, etc.) or whether or not they follow the author.” Further, “multiple views may be counted if you view a Tweet more than once, but not all views are unique. For example, you could look at a Tweet on web and then on your phone, and that would count as two views.” 
Twitter video views: In the case of video on Twitter, the company says, “The main Twitter video view metric is triggered when a user watches a video for at least 2 seconds and sees at least 50% of the video player in-view.” In other words, those millions of viewers on Carlson’s video haven’t necessarily watched the whole thing—not by a long shot.
TV ratings: Ratings—at least, the ones typically cited—are usually calculated by a company called Nielsen Media Research. Ratings are usually expressed as a percentage of the population or demographics, and are a sort of indicator telling us the average number of viewers for a block of programming. For instance, during the week of April 24-30, 60 Minutes was the third-highest-rated show among primetime broadcast programs with a rating of 4.3 and 7.1 million viewers. But note those were the average number of viewers throughout the entire show. 

So while Carlson’s tweet may have garnered tens of millions of views—a number that is indeed higher than your average hourly audience of a given Fox News television show—attempting to draw conclusions from Twitter views versus TV ratings is a bit of an apples-and-oranges comparison.