To display information about your network, simply paste the following piece of code where you want the info to be shown, for example in your theme footer.
<?php if( is_multisite() ): ?> The <a href="<?php echo esc_url( get_site_option( 'siteurl' ) ); ?>"><?php echo esc_html( get_site_option( 'site_name' ) ); ?> network</a> currently powers <strong><?php echo get_blog_count(); ?></strong> websites and <strong><?php echo get_user_count(); ?></strong> users. <?php endif; ?>
Once you saved the file, your blog network name as well as the user/blogs count will be displayed.
Thanks to Kevin Leary for the cool tip!
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WordPress tip: Display informations about your multisite install