Which ranking signal generally has the most immediate impact on content visibility after a user interacts with a post?

A 'save' generally has the most immediate impact on content visibility after a user interacts with a post. Instagram's algorithm interprets a save as a strong indication that the user finds the content valuable and worth revisiting. This signal carries more weight compared to likes, comments, or shares because it signifies a higher level of interest and perceived utility. For example, if a user saves a post about a recipe, the algorithm infers they intend to use it later, suggesting the content is highly relevant to their interests. Consequently, the algorithm is more likely to show similar content from that account, or related accounts, to the user in the future. While likes and comments are valuable engagement signals, they primarily indicate enjoyment or a desire for conversation, whereas a save implies long-term value and relevance, thus influencing the algorithm more directly and immediately.