We have an integration of JReviews activities with EasySocial and in the past even guest activities were stored in the stream. However, this is no longer the case. I am testing with the latest version of EasySocial. I can see these notices appear when the EasySocial stream code is run:

<li>[8] Trying to get property of non-object on line 474 in file /administrator/components/com_easysocial/includes/stream/template.php</li>



<li>[8] Trying to get property of non-object on line 475 in file /administrator/components/com_easysocial/includes/stream/template.php</li>

And in the following link you can find the code we use in JReviews to add the activities to the stream http://pastebin.com/TT0bfNUB