Oh haha, Don't worry about it :P It wasn't about that kind of thing and while it probably would be good to cite sources for all images, I think for comments (where monetarily do not benefit as much as posting) it should be safe-r to use images, as this could be compared to the ongoing use of memes and such on Facebook/Other Social media. It's really only when Monetary benefit kicks in (where posts earn > $1) that copyrights, plagiarism, etc apply and are actionable, and for these cases Curie will understandably Not Up vote as this could be damaging for Curie as being seen as monetarily benefiting (from Curation reward) from Copyrighted/Plagiarized content.