Shashi Kumar

BuddyPress is a great plugin to create a community website. Users get engaged by adding various updates, comments, and replies. It provides the capability to favorite an activity. If you like the update you can favorite it and it will be added to my favorites section. But, BuddyPress does not provide any direct method to show them how many favorites you activity has received. This plugin is built to show the total number of favorites count in a beautiful way. By default, it will show three avatars of the recently favorited user and the total count of favorites.

BP Who Favorited

A plugin to show users who have favorited a BuddyPress activity.

Huseyin Berberoglu

Allows users to add favorite posts. This plugin use cookies and database for 
saving data.
<ul>
<li>If a user logged in then favorites data will saved in database instead of cookies.</li>
<li>If user not logged in data will saved in cookies.</li>
</ul>
You can choose “only registered users can favorite a post” option, if you want. 
Also there is a widget named “Most Favorited Posts”. And you can use this template 
tag for listing most favorited posts;
Most Favorited Posts
If you use WP Super Cache you must add page (which you show favorites) URI to “Accepted Filenames & 
Rejected URIs”.
If you need support <a href="https://wordpress.org/support/plugin/wp-favorite-posts" rel="ugc">create a topic on support forum</a>
Please submit your pull requests to https://github.com/hberberoglu/wp-favorite-posts

WP Favorite Posts

Allows visitors to add favorite posts. This plugin use cookies for saving data so
unregistered users can favorite a post.

BP Who Favorited vs WP Favorite Posts