Instagram's feed algorithm has shifted from solely showing posts in chronological order to showing them in order of relevance. This means that user sees posts at the top of their feed that are deemed most relevant to them, regardless of when they were posted.

Instagram determines the relevance of a post based on several factors, including:

- The relationship between the user and the poster

- The level of user interaction with the poster

- The timeliness of the post

- The content of the post, including the use of hashtags

Instagram's algorithm is constantly evolving, so the exact factors that determine relevance may change over time. However, the goal of the algorithm is to provide users with a more personalized and engaging feed.