I had a blog running on Tumblr on
foobar.tumblr.com and at some point I thought I'd just get
foobar.com and set that up as a custom domain.
Yet, as far as I can tell, there is no way I can communicate Google a change of domain from third to second level, other than setting up 301 everywhere (e.g. there is no reference here, and the change domain option in Webmaster Tools is disabled).
While the redirects are not an issue (Tumblr does that automatically) it seems strange that such a common operation can't be helped, and at the moment I see both domains in search results, which appears mighty strange.
Is there something else I could do other than wait for the old domain to disappear?