1. The document discusses how signal detection theory, which describes how people decide what information to pay attention to, can be applied to distinguishing between good and bad posts on Instagram. Specifically, it is currently difficult for users to tell the difference between organic user posts and sponsored ad posts on Instagram. 2. The recommendation is to add more visual cues to clearly identify ad posts, such as using vertical banners for ads and adding horizontal spacers between organic and ad posts. This would make it easier for users to distinguish signals from noise and reduce the cognitive effort required. 3. Metrics like engagement rates, app ratings, and the percentage of likes on organic vs ad posts could be measured before and after changes to evaluate if users