I don’t really use Dokuwiki as much and the plugin below has been superseded by various other implementations so really you should probably ignore everything below this….. (I hate broken URLs so it will remain online here).
A plugin for Dokuwiki which offers easy to use inclusion of Facebook like and comment social plugins.
<fbl> ~ Inserts a Facebook like button
<fbc> ~ Inserts a Facebook comment box this also includes a like button.
Download from Github