If you asked me to pass on a letter then I tell you that I've done so, you'd be annoyed if you found out that I actually just threw it away. If I told you up front that I wasn't willing to pass it on then you could find someone else to do so, but the silent nature inhibits that.

Even without the silence, there's concern about the power and influence held by a few large social media companies with billions of conversations taking place through them. There's been some bipartisan interest in forcing them to either act more like a common carrier or be subject to the full responsibilities of a publisher.