Every time I try to put a blog into StumbleUpon, it replies that it does not accept Blogger site submissions.And the URL, when stated, will be a non "BlogSpot.com" country code alias.
StumbleUpon Support has provided an official response, shedding some light.
In StumbleUpon Help: Blogspot.com.[country] submissions - Unable to add, we see an Official Response.
We have, at this time, excluded content from the various blogspot.xxx country domains from being added to StumbleUpon.If you're trying to add your blog to StumbleUpon, and you're seeing
We don't accept submissions from this site.Just provide the "blogspot.com" URL alias for your non custom domain published blog, when submitting to StumbleUpon. That is where the Blogger traffic goes, any way. If your blog is published to a custom domain, you'll see no problem.
StumbleUpon is simply one more Internet service that does not support the Canonical tag, as used by Blogger in their BlogSpot country code aliased URLs.