The activity feed plugin displays the most interesting recent activity taking place on your site. Since the content is hosted by Facebook, the plugin can display personalized content whether or not people have logged into your site. The activity feed displays stories when people interact with content on your site, such as like, watch, read, play or any custom action. Activity is also displayed when people share content from your site in Facebook or if they comment on a page on your site in the Comments box. If people are logged in to Facebook, the plugin will be personalized to highlight content from their friends. If people are logged out, the activity feed will show recommendations from across your site, and provide the option to log in to Facebook.

The plugin is filled with activity from people's friends. If there isn't enough friend activity to fill the plugin, it is backfilled with recommendations. If you set the recommendations param to true, the plugin is split in half, showing friends activity in the top half, and recommendations in the bottom half. If there is not enough friends activity to fill half of the plugin, it will include more recommendations.

Source: https://developers.facebook.com/docs/reference/plugins/activity/

BackEnd

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Frontend