That was my understanding as well; that it would effectively work just like GChat (where spam certainly exists, but is a trivial problem). TFAuthor dismissed t

That was my understanding as well; that it would effectively work just like GChat (where spam certainly exists, but is a trivial problem). TFAuthor dismissed that as a non-option, because it would make Wave unsuitable for collecting unsolicited feedback and sales contacts. But it seems to me that a single Wave account that auto-whitelisted contact attempts would solve that problem at the cost of reintroducing some capacity to spam, but at a vastly reduced level. Simply applying existing tools and leveraging the other benefits of Wave over SMTP would seem to seriously marginalize spam as a concern.