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.

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

My Faves for WP vs wp_favorites