Index: src/wp-admin/includes/schema.php
===================================================================
--- src/wp-admin/includes/schema.php	(revision 25017)
+++ src/wp-admin/includes/schema.php	(working copy)
@@ -828,6 +828,10 @@
  * 	so the error code must be checked) or failure.
  */
 function populate_network( $network_id = 1, $domain = '', $email = '', $site_name = '', $path = '/', $subdomain_install = false ) {
+	/**
+	 * @var WPDB $wpdb
+	 * @var WP_Rewrite $wp_rewrite
+	 */
 	global $wpdb, $current_site, $wp_db_version, $wp_rewrite;
 
 	$errors = new WP_Error();
@@ -891,33 +895,34 @@
 --The Team @ SITE_NAME' );
 
 	$sitemeta = array(
-		'site_name' => $site_name,
-		'admin_email' => $site_user->user_email,
-		'admin_user_id' => $site_user->ID,
-		'registration' => 'none',
-		'upload_filetypes' => 'jpg jpeg png gif mp3 mov avi wmv midi mid pdf',
-		'blog_upload_space' => 100,
-		'fileupload_maxk' => 1500,
-		'site_admins' => $site_admins,
-		'allowedthemes' => $allowed_themes,
-		'illegal_names' => array( 'www', 'web', 'root', 'admin', 'main', 'invite', 'administrator', 'files' ),
-		'wpmu_upgrade_site' => $wp_db_version,
-		'welcome_email' => $welcome_email,
-		'first_post' => __( 'Welcome to <a href="SITE_URL">SITE_NAME</a>. This is your first post. Edit or delete it, then start blogging!' ),
-		// @todo - network admins should have a method of editing the network siteurl (used for cookie hash)
-		'siteurl' => get_option( 'siteurl' ) . '/',
-		'add_new_users' => '0',
+		'site_name'                   => $site_name,
+		'admin_email'                 => $site_user->user_email,
+		'admin_user_id'               => $site_user->ID,
+		'registration'                => 'none',
+		'upload_filetypes'            => 'jpg jpeg png gif mp3 mov avi wmv midi mid pdf',
+		'blog_upload_space'           => 100,
+		'fileupload_maxk'             => 1500,
+		'site_admins'                 => $site_admins,
+		'allowedthemes'               => $allowed_themes,
+		'illegal_names'               => array( 'www', 'web', 'root', 'admin', 'main', 'invite', 'administrator', 'files' ),
+		'wpmu_upgrade_site'           => $wp_db_version,
+		'welcome_email'               => $welcome_email,
+		'first_post'                  => __( 'Welcome to <a href="SITE_URL">SITE_NAME</a>. This is your first post. Edit or delete it, then start blogging!' ),
+		'siteurl'                     => get_option( 'siteurl' ) . '/',
+		'add_new_users'               => '0',
 		'upload_space_check_disabled' => is_multisite() ? get_site_option( 'upload_space_check_disabled' ) : '1',
-		'subdomain_install' => intval( $subdomain_install ),
-		'global_terms_enabled' => global_terms_enabled() ? '1' : '0',
-		'ms_files_rewriting' => is_multisite() ? get_site_option( 'ms_files_rewriting' ) : '0',
-		'initial_db_version' => get_option( 'initial_db_version' ),
-		'active_sitewide_plugins' => array(),
-		'WPLANG' => get_locale(),
+		'subdomain_install'           => intval( $subdomain_install ),
+		'global_terms_enabled'        => global_terms_enabled() ? '1' : '0',
+		'ms_files_rewriting'          => is_multisite() ? get_site_option( 'ms_files_rewriting' ) : '0',
+		'initial_db_version'          => get_option( 'initial_db_version' ),
+		'active_sitewide_plugins'     => array(),
+		'WPLANG'                      => get_locale(),
 	);
 	if ( ! $subdomain_install )
 		$sitemeta['illegal_names'][] = 'blog';
 
+	$sitemeta = wp_parse_args( apply_filters( 'populate_network_sitemeta', $sitemeta ) );
+
 	$insert = '';
 	foreach ( $sitemeta as $meta_key => $meta_value ) {
 		if ( is_array( $meta_value ) )