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Added capture to specify.
Sorry my bad english.
It's a plugin named "Reactions" which is only available the customers of the hosted plan: http://vanillaforums.com/
Kasper Kronborg Isager (kasperisager) | Freelance Developer @Vanilla | Hit me up: Google Mail or Vanilla Mail | Find me on GitHub
There is someone similar? Is awesome :-)
You could use something like Kudos: http://vanillaforums.org/addon/kudos-plugin
Now exist someone similar? Kudos not work on 2.2