First of all check whether user belong from current site by using

     <?php is_user_member_of_blog( $user_id, $blog_id ); ?>

After you get id of user create user role 

    $user = new WP_User( $user_id );
    if ( $user ) {
   $roles = $user->roles; 

and in last create posts for every user by adding role in args. not tested but i'll do trick for you.

			<?php
			$args1 = array(
			 'role' => 'subscriber',
			 'orderby' => 'user_nicename',
			 'order' => 'ASC'
			);
			 $subscribers = get_users($args1);
			echo '<ul>';
			 foreach ($subscribers as $user) {
			 echo '<li>' . $user->display_name.'['.$user->user_email . ']</li>';
			 }
			echo '</ul>';
}		
	?>