Show Following Users Activities + User Own Activities Only

yzc_followings_only_activity_args.php

<?php
/**
 * Show Following Users Activities + User Own Activities!
 */
function yzc_followings_only_activity_args( $args ) {

    if ( ! bp_is_activity_directory() || !  is_user_logged_in() ) {
        return $args;
    }

    // Get User ID.
    $user_id = get_current_user_id();

    // Get Users.
    $user_ids = (array) bp_follow_get_following( array( 'user_id' => $user_id ) );

    // Include users own too?
    array_push( $user_ids, $user_id );

    $args['user_id'] = $user_ids;

    return $args;

}

add_filter( 'bp_after_has_activities_parse_args', 'yzc_followings_only_activity_args' );