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This allows you to mirror content from your public WordPress blog inside your Ning Network, so your members can add comments without needing to visit a separate website.
You can also create a private WordPress blog that publishes directly to your Ning Network. This gives you the same seamless integration you’d get from using Ning’s built-in blogging tools, while allowing you to take advantage of advanced WordPress features and workflows.
Head over to the Ning Publisher for WordPress Help Center article to get started.