True Sharing vs Fake Sharing

So there's an important distinction developing among “user generated content� sites — the distinction between sites that permit “true sharing� and those that permit only what I'll call “fake sharing.� A “true sharing� site doesn't try to exercise ultimate control over the content it serves. It permits, in other words, content to move as users choose. A “fake sharing� site, by contrast, gives you tools to make seem as if there's sharing, but in fact, all the tools drive traffic and control back to a single site.