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function wpmu_activate_signup( $key ) {
	global $wpdb;

	$signup = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $wpdb->signups WHERE activation_key = %s", $key ) );

	if ( empty( $signup ) ) {
		return new WP_Error( 'invalid_key', __( 'Invalid activation key.' ) );
	}

	if ( $signup->active ) {
		if ( empty( $signup->domain ) ) {
			return new WP_Error( 'already_active', __( 'The user is already active.' ), $signup );
		} else {
			return new WP_Error( 'already_active', __( 'The site is already active.' ), $signup );
		}
	}

	$meta     = maybe_unserialize( $signup->meta );
	$password = wp_generate_password( 12, false );

	$user_id = username_exists( $signup->user_login );

	if ( ! $user_id ) {
		$user_id = wpmu_create_user( $signup->user_login, $password, $signup->user_email );
	} else {
		$user_already_exists = true;
	}

	if ( ! $user_id ) {
		return new WP_Error( 'create_user', __( 'Could not create user' ), $signup );
	}

	$now = current_time( 'mysql', true );

	if ( empty( $signup->domain ) ) {
		$wpdb->update(
			$wpdb->signups,
			array(
				'active'    => 1,
				'activated' => $now,
			),
			array( 'activation_key' => $key )
		);

		if ( isset( $user_already_exists ) ) {
			return new WP_Error( 'user_already_exists', __( 'That username is already activated.' ), $signup );
		}

		/**
		 * Fires immediately after a new user is activated.
		 *
		 * @since MU (3.0.0)
		 *
		 * @param int    $user_id  User ID.
		 * @param string $password User password.
		 * @param array  $meta     Signup meta data.
		 */
		do_action( 'wpmu_activate_user', $user_id, $password, $meta );

		return array(
			'user_id'  => $user_id,
			'password' => $password,
			'meta'     => $meta,
		);
	}

	$blog_id = wpmu_create_blog( $signup->domain, $signup->path, $signup->title, $user_id, $meta, get_current_network_id() );

	// TODO: What to do if we create a user but cannot create a blog?
	if ( is_wp_error( $blog_id ) ) {
		/*
		 * If blog is taken, that means a previous attempt to activate this blog
		 * failed in between creating the blog and setting the activation flag.
		 * Let's just set the active flag and instruct the user to reset their password.
		 */
		if ( 'blog_taken' === $blog_id->get_error_code() ) {
			$blog_id->add_data( $signup );
			$wpdb->update(
				$wpdb->signups,
				array(
					'active'    => 1,
					'activated' => $now,
				),
				array( 'activation_key' => $key )
			);
		}
		return $blog_id;
	}

	$wpdb->update(
		$wpdb->signups,
		array(
			'active'    => 1,
			'activated' => $now,
		),
		array( 'activation_key' => $key )
	);

	/**
	 * Fires immediately after a site is activated.
	 *
	 * @since MU (3.0.0)
	 *
	 * @param int    $blog_id       Blog ID.
	 * @param int    $user_id       User ID.
	 * @param string $password      User password.
	 * @param string $signup_title  Site title.
	 * @param array  $meta          Signup meta data. By default, contains the requested privacy setting and lang_id.
	 */
	do_action( 'wpmu_activate_blog', $blog_id, $user_id, $password, $signup->title, $meta );

	return array(
		'blog_id'  => $blog_id,
		'user_id'  => $user_id,
		'password' => $password,
		'title'    => $signup->title,
		'meta'     => $meta,
	);
}