>>693639People may have reposted infected pictures there without knowing. I had a couple pics I didn't know about at first either until they failed 4chan's screen and I gave them a look.
Easy problem to fix, fortunatly. If you've got infected pics you want to save, just open them in the image program of your choice, and save them anew. Image program creates a brand new copy from the image data, without the bullshit. Delete infected copy, problem solved.