Ok, so I guess I’ll actually post something that is nearly worth calling content.
As the internets have evolved, many things have ended up in many places. One such thing is the common image file. Images can convey a spectrum of emotions, from lulz to bawws to d’awws (and perhaps even some in between these well-defined and well-known examples of emotions).
Occasionally, we come across an image so right, an image so unbelievable and worth living for that we must know where it came from. Across the land message board,people cup their hands to their mouths and shout, “PARDON ME, GENTLEMEN AND LADIES. I WISH TO INQUIRE FROM WHENCE THIS PICTORIAL HAS BEEN DELIVERED! FOR I, BEING A MAN OF GOD, MUST SEEK IT TRULY, AS MY LIFE-MISSION!” people clickity-clack with their fat fingers, “SAUCE PLZ!”
Well fear not friends and demon hunters, we now have salvation.

TinEye
Luckily, I chose an absolutely worthless example to search for, but MARK MY WORDS: You can find where things come form here, be it obscure Japanese anime porn or less-obscure Japanese anime porn. Oh, and other images too.
TinEye probably has some crazy-ass advanced techniques to spider the multiwebs and detect this and that, etc, etc. I honestly have no idea how it works and have been ignorantly happy to use it time and time again! In fact, I’ve never clicked any of the links or ventured beyond the main page — I am (mentally) forced to search for an image when I’m there; there are no other options.
Perhaps I will continue this enthralling expose on TinEye and actually learn something about it. Until then, just use it and thank me later.
Update:
Well, post-post (lolol) I thought I should probably also mention SauceNAO, which has also enjoyed a spattering of my searches. Well, after starting every sentence with “Well,” I decided that I should maybe take a little screenshot to show the minimalism. Well, The results were actually pretty awesome, so here they are (say nothing of my source image!):
I’d say SauceNAO wins this round, hands down.