How do I know if a user has a blog in WordPress Multisite?

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I have a WordPress Multisite installation with Buddypress. I would want to restrict people from creating another blog so that they have only one blog.

How do I achieve this?

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  1. Check the user meta key primary_blog:

    $user_has_blog = get_user_meta( $user_id, 'primary_blog', TRUE );

    For users without a blog $user_has_blog will be false now. For other users $user_has_blog is the blog ID.