Sana Azmeh

Save your important posts, so you can return to them at any time and read or view them again.
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To add post to your list press Fave it button, then add tags and press enter
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To remove post from your list press Unfave it button
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You can style the button as you want or it gets the default style matching the template
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To add post to faves list use shortcode [myfaves-add]
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You can add the shortcode in sidebar or footer widget or below header.
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To list the faves use shortcode [myfaves-list]
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To list faves tags or collections use shortcode [myfaves-tags]
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Fave tags links will list posts related to specific tag for logged in user
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</ul>

My Faves for WP

Save your favorite posts, add tags, and list them.

cleancodenz

If your wordpress site is tracked by Google Analytics, then you can get access to all those stats about your site like visitors, keywords and pageviews. But it is not easy to present some of those stats on your wordpress site if you want to, like which posts are visitor’s favorite posts? because data in Google Analytics 
about the sites you are tracking are private to the account holder, not to the general public.
This plugin uses Google Analytics API to get the stats of favorite posts of your wordpress blogs and list them in a table
To use this plugin, you need a Google Analytics Account and a profile which is your wordpress install, your Google Analytics information are encrypted and saved in options.
Any issues: <a href="http://www.cleancode.co.nz/contact" rel="nofollow ugc">contact me</a>.

CleanCodeNZ Favorite Posts Plugin

This plugin uses Google Analytics API to get the stats of favorite posts of your wordpress blogs and list them in a table

My Faves for WP vs CleanCodeNZ Favorite Posts Plugin