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 create a topic on support forum
Requires: 2.0.2 or higher
Compatible up to: 3.5.2
Last Updated: 2012-12-31
1 of 20 support threads in the last two months have been resolved.
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