fb_post_help_for_faisal.php

<?php
$post_imit_each_column = 4;
/**
 * To get all Categores as Array, 
 * Each array Item will be Object - Remember it
 * Tuts for: https://www.facebook.com/groups/rrfoundation/permalink/1714332322007066/
 * And: https://www.facebook.com/groups/UFTalent/permalink/401160307058625/
 * 
 * @author Saiful Islam<[email protected]>
 */
$categories = get_categories();
foreach ($categories as $category) {
    $cat_number = $category->cat_ID; //Cat ID/ Term_ID

    $your_catname = get_cat_name($cat_number); //If you want to show your category name any where.

//You can display your cat as your style

    $args = array(
        //All other here
        'cat' => $cat_number,
        'posts_per_page' => $post_imit_each_column, //4 or your wish
    );

    $query = new WP_Query($args);

    if ($query->have_posts()) : while ($query->have_posts()): $query->the_post();
            /**
             * Your Desired execution here.
             * Thanks
             * @author Saiful Islam<[email protected]>
             */
        endwhile;
        wp_reset_query();
    else:
    //Nothing found
    endif;
}