To show an activity stream update on a user comment in K2 do the following:components/com_k2/models/item.php   look for if ($params->get('commentsPublishing')) { (about Line 650)and add directly after//

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//jomsocial activity stream include                $JSinstallchk = JPATH_BASE . DS . 'components' . DS . 'com_community' . DS . 'libraries' . DS . 'core.php';                                                            //activity stream  - added a comment                if ( file_exists($JSinstallchk)) {                require_once($JSinstallchk);                }                    $contentTitle = $item->title;                          $link = K2HelperRoute::getItemRoute($item->id.':'.urlencode($item->alias),$item->catid.':'.urlencode($item->category->alias));                    //$item->link=urldecode(JRoute::_($link));                    $item->link=$link;                                                                                      $act = new stdClass();                    $act->cmd    = 'wall.write';                    $act->actor    = $user->id;                    $act->target    = 0; // no target                    $act->title    = JText::_('{actor} hat den Artikel <a href="'.$item->link.'">'.$contentTitle.'</a> kommentiert');                    $act->content    = '';                    $act->app    = 'wall';                    $act->cid    = 0;                                          CFactory::load('libraries', 'activities');                    CActivityStream::add($act);//

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I used code from bwilhelm (www.jomsocial.com/webforum/viewtopic.php?f=20&t=3995) and changed it. So the credits mainly go to him

Wonderful idea..
Nice post " Nico Essig"..
Thanks for sharing

Nice for sharing.

NOTE: Makes sure you make a copy of your item.php, just in case ;)

Simon
K2 Support

Yes. Please do backup your item.php

I edited the first post to include that in a more sophisticated way. This works for cached and uncached sites now.