Bloggers who use Twitterfeed and similar services to send updates to their Twitter accounts when they create blog posts are still unable (at press time) to run automated posts to Twitter.

Twitterfeed.com and other services were blocked by Twitter following Thursday’s denial-of-service attacks. Twitter has implemented very aggressive IP address filtering according to an update at GetSatisfaction. Twitter promises to look into the issue but there’s no telling when auto-update services like Twitterfeed might be permitted to resume. Bottom line, if you’re having trouble with those automatic blog post updates on Twitter, it’s not Twitterfeed’s fault, access has been denied by Twitter until further notice.