Ultimately, I think that the junk filter will be better than a staight size filter. Imagine if they had done a size filter - then everyone would be upset that they couldn't get that legitamate .zip file that just happened to be 851.7 kb also.

Until the filter gets better or they implement a size option, what i have started doing is picking some of the REALLY common ones that i encounter and make files of the same type (.mp3, .jpg, .zip, etc.) but named something like - "[filename] 851.7 is a virus, please delete" and sharing it. It should show up in the same search, and once the unwitting accomplices see the word "VIRUS" they will probably react pretty quickly. Note: make the file at least 0.1 kb so that it isn't filtered out as 0.0 kb "junk"