I'm so sorry for the delayed response. There was a change in v8 that caused this problem and it's very easy to correct. Can you please edit the following file:
/media/sourcecoast/themes/scsocialstream/default/facebook.php
Around line 25, you'll see:
if(isset($this->authorID))
Please update that to:
It's such a small change, but took a bit of time to track down why it had changed and if the minor update above was appropriate (and wouldn't cause other problems). From what we've tested, that should get you going.
Please let us know if that works and we'll make sure that it gets into the next release so you don't have to deal with this again.
Thanks,
Alex