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@szed
Use the plugin I mentioned above and modify it like like so:
In line 84-86 in bp-activity-as-shortcode.php you will see:

<?php if($title): ?>
<h3 class="activity-shortcode-title"><?php echo $title; ?></h3>
<?php endif;?>


Just above that add this:

<?php if ( is_user_logged_in() ) : ?>

<?php locate_template( array(…[Read more]

@szed
I would suggest:

BuddyPress Activity Shortcode