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There is "Like" and "Dislike" button. But users don't see the reason to use them because there is no any list of "Most Liked Videos / photos / groups / profiles etc".
Also "Most Liked / Disliked" modules would be great.
I post it there: http://uservoice.jomsocial.com/forums/101561-feature-request/suggestions/4546370-show-most-liked-page-and-module
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