Visit the Posts page here: https://yourportalname.campusesp.com/admin/posts. You can also get here by navigating to Content-->Posts.

This will automatically sort your posts from most number of clicks to least number of clicks.

Here, you can analyze posts that have been created during a particular time parameter by choosing a start and end date in the top righthand corner. For example, you may be interested in looking at post engagement from January-March of the current year. After you adjust the dates accordingly, click the blue "Update" button to see the results.