Hm, the styling doesn't seem to be used when the code is generated from EasyDiscuss and showing in EasySocial's feed. Is it suppose to be like that?
--EDIT--
Or even within EasyDiscuss, for that matter. The styling is entirely dependent upon ES/ED theme and site template. While I noticed everything should be compiled with LESS.js, I'm not seeing any traces of Prism. Looking easydiscuss-2015.less within /media/com_easydiscuss/styles-lib/easydiscuss/ I see that the import method is @import "prism.less";. But prism.less resides within /styles-lib/vendors/prism/. Experimenting with this now.