The CEO of Substack noticed an increase in traffic from Twitter, which is attributed to Twitter's new behavior of loading links in a webview in the background, even if the user doesn't click on them. This change has caused a surge in traffic for websites linked from Twitter. The author of the post suggests that this is not a genuine increase in engagement, but rather a result of Twitter's new link handling. Twitter's CEO had previously expressed concerns about users sharing links to other platforms.