11/19: It's coming back. See this post for details.
There was a major increase in use of Little Pork Chop a couple of weeks ago, when it was discovered by spammers, apparently as a way of working around Twitter's spam detection system? I don't know. But thousands of messages were going out every hour, most of them spam, directed at individuals in many cases. I never anticipated that it would be used primarily in this mode, and it's totally not something I want to support.
Perhaps I'll find time to make Little Pork Chop an invite-only affair, rather than being open to the world. I'm sure it's not hard to do, but I already am over-committed. If you have a strong feeling about it, please post a comment below. But if you're a spammer, wanting to use it for spam, please don't plead your case. Pointless.