mrzerog

WP Favorites allows your logged in users to favorite a tag, and allows them to see only posts that have that tag. They can also favorite multiple tags, and see only posts that have all those tags (or optionally any post with any of those tags). Example: You run a site about tea, iced and hot, green black and white. You tag every post green, black, or white, as well as iced or hot. Your user only likes iced green tea, so they favorite the ‘iced’ tag, and the ‘green’ tag. Then, they can see only posts pertaining to iced green tea (or optionally any post’s tagged either iced or green). Users are able to favorite a tag from it’s archive page.

wp_favorites

wp_favorites allows a logged in user to favorite a tag or tags and then show only posts that have that tag or a combination of those tags

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 …

wp_favorites vs WP Favorite Posts Extended