The difficulty will be to find sources to match against (unsure if scraping Google will be permitted, we'll see).
Google has a search API. Not sure if there is a free tier though.
Considering their pricing change on maps, I'm going to assume not. I'll look into it though, thanks
@LoyceV: I'll make a note that if comparing messages for plagiarism, we should probably be ignoring ["quote"] tags within our scripts. I know it would probably make plagiarism detection more reliable, I'd just have to write a side-script to prevent users from just wrapping their messages in ["quote"] tags.