I keep my writing to myself. There are too many places for it to be published for me to even know if it's been stolen. And it's really tough to prove or recoup losses, so it's not worth it unless I'm paid to publish online. Then the site that paid for it is obligated to protect it.

The only exception to that is on the writing forum, where I trust my fellow writers. They're better than me anyway so why would they pilfer my stuff?