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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My Faves for WP

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

avrilmaomao

This plugin is based on “WP Favorite Posts”,and extends json api to provide access for mobile apps. 
Three methods are provided: 
wpfp/add 
 postid: required 
 cookie: optional 
wpfp/remove 
 postid：required 
 cookie：optional 
wpfp/lists 
 cookie ：optional 
The cookie param is the same as “JSON API USER” plugin used.
These methods support users not logged,if the client side can receive and send cookies.
code can be found at: https://github.com/avrilmaomao/wp-favorite-posts-extended

WP Favorite Posts Extended

wp-favorite-posts, reading list, post list, post lists, lists Requires at least: 3.5 Tested up to: 4.0 Stable tag: 0.1 Based on plugin "WP Favor …

My Faves for WP vs WP Favorite Posts Extended