>>941451746 (OP)
Your image file name is jorsegirl.jpg so unless you manually renamed it, or have a plugin that preserves the name, that file is not a repost from here.
Most images like this have a serial number attached. This will show the thread you saved an image from. Also you can track when the same file is posted. So you can build a relation between which posters post which files and where they saved them from. You can map out previous times they posted it.
Some times this gets broken if you have multiple people save the same image from the same thread and then re-use it a bunch. But for like 97% of the time, you can know if someone posted an image with a serial number you can see all the other times that poster posted that image and what comments they made all the other times when using it. You can see what threads they viewed and build a model of the user.
Works better on boards with ID's so you can track every post they make in any thread they post any image in and link it all up together and buil up quite the post history profile on someone.
And all this is without mod tools.
But also when you frequent certan threads ppl get to know you based off persinality and shit.