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Have you started your blog on WordPress.com, and then thought about moving on to a self-hosted WordPress installation? The move gives you more freedom, but it also hurts your blog's SEO rankings. Now, however, WordPress offers a solution: Offsite Redirect.
The new feature, which can be accessed in your dashboard under "Upgrades," lets you permanently redirect your WordPress.com blog to another web address. The upgrade is not free, but it costs an affordable $12 per year.