Who added post to favorites

Preamble:
The only plugin that is convenient to work, but he did not develop further. From a simple thing you can do with him now – do it like a button like as Facebook…

Real:
Tried to deduce the users who have added to favorites post, but it is not clear how the binding to the user.

I would like these changes:
– Convenient button design through css
– List, who added the entry when you hover over the button
– Counter, the number of records in the users’ profile

Thank, still hope plugin will be updated …

https://wordpress.org/plugins/wp-favorite-posts/