Well, not so much piracy as copyright infringement.
A few years ago, the company I worked for, Inkstop, suddenly closed its doors and didn't pay its nearly 500 employees our last three weeks' wages. I was one of the people who worked to organize us all. I used many methods, including Daily Kos, to gather us together. Of all the methods, Facebook was the most effective.
One of our members created a satirical take on the company's logo which I posted on the FB page. A little while later, I got an email from FB notifying me that the logo was taken down because of a possible copyright violation. They contended we used their logo without permission. I contended that it was satire, and, therefore, protected speech. Unless Inkstop's logo really is "Fuel to ruin your life."
The process worked its way along, and within a week or so, the logo was restored. The existing copyright laws work.
But what if SOPA/PIPA were the law of the land? Would Facebook have taken down our page? The best, most effective method I had to unite us all? Prevent us from establishing a new page? I don't know. All I know, is that a minor infraction could have become a major pain in the a$$, and a hindrance to our ultimate victory. Yeah, we won. All of us got money back. Most importantly, our former bosses were shown in court to be the criminals they are.
But would we have won without our unity? I don't know.
I called my Senators and Congressman. I told them this story. They thanked me for a personal, tangible reason to oppose this law.