You will simply tag your pictures otherwise you can produce fancy tooltips on your pictures. it's compatible with most of the browsers and after all it's extremely customizable! It supports conjointly permission management and it's deeply integrated with WordPress. you'll be able to enable your users to form stickies however you'll be able to approve or reject them from a unfinished list.
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Demo:
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CodeCanyon wpStickies v1.2 – The Premium Image Tagging Wordpress Plugin