As suggested I’m opening a new thread mostly to point out older sources for a few articles (it’s possible I won’t go through everything today).
Let’s start with:
That Really Rustled My Jimmies
As it comes to no surprise, neither phrase nor image macro actually originated on Funnyjunk.
The earliest instance on foolz archive has a post on /tv/ from February 2010, where the image macro was used an every post that used it since then. Though as we see from the filename (126479446092.jpg), this isn’t the original post, as the pic was saved some time before (actually exactly 29.01.2010). The phrase itself gets used for the first time on /jp/ in August 2009 .
Now, unfortunately that is not the origin point as well, which actually happened on /r9k/ (just not in the thread mentioned in the article). Foolz archive only archives a handful of boards (though most of the big ones outside of /b/) and as we see that phrase really has been used pretty rarely throughout 2010. Unfortunately the automatic archive for /r9k/ was implemented only this year, so any earlier topics have not been saved, except the ones on chanarchive.org, which only saves requested topics. As of now, to my knowledge, these are the oldest sources for that particular meme.