I've "shared files" on-line since 1982, but in the narrower current (mis)use of the term I don't.
I don't copy things I don't have the right to copy, I don't borrow CD's from others and copy them, I don't copy mine and give them to others (though I
DO copy tracks from CD's I've bought into compilations for my personal use).
I also don't copy and either use or re-distribute images or text that belongs to others without their permission.
I've had both my and my client's images and text on-line for years, and I've persued others who have copied or used those works. Most notably a rock band that stole (yes, that's what it is) an image from a client's web site and re-used it on their own.
My client had paid money to have that image commercially created, and the band in Chicago did not have the permission to use it (nor would my client have given it - she asked that I take action to get it stopped).
I dropped them an e-mail asking them to remove it from their site and not to use it, and they responded that they'd do whatever they wanted to with it because they'd found it on-line (at my client's site) and therefore it was "public domain."
My next contact was the ISP and their management company's lawyers.
Outcome: The ISP bounced them and their management company corrected their odd view of reality.
I've also gone after two European sites for using my stuff, and had it removed from their site in one case, and properly credited (plus a link) on the other (that's what I asked for in return for their continued use of my images).
Ok, I'll crawl back under my log soon.
Short answer: No, I do not steal other people's property - I only copy WITH PERMISSION.
Resident curmudgeon,