This is due to Facebook API changes. The patch supplied by Vector Media for this is as follows
system/expressionengine/third_party/campaigns/services/service.facebook.php, line 90. Replace:
$html .= '<a href="'.$res->link.'" target="_blank">View Profile</a>';
With this:
$html .= '<a href="'.@$res->link.'" target="_blank">View Profile</a>';
And system/expressionengine/third_party/campaigns/views/status/facebook.php, lines 19 and 20. Replace:
<strong>From Account: </strong> <a href="https://www.facebook.com/<?=$fbData->from->id?>" target="_blank"><?=$fbData->from->name?></a><br>
<strong>Link: </strong> <a href="https://www.facebook.com/<?=$fbData->id?>" target="_blank">https://www.facebook.com/<?=$fbData->id?></a><br>
With this:
<strong>From Account: </strong> <a href="https://www.facebook.com/<?=@$fbData->from->id?>" target="_blank"><?=@$fbData->from->name?></a><br>
<strong>Link: </strong> <a href="https://www.facebook.com/<?=@$fbData->id?>" target="_blank">https://www.facebook.com/<?=@$fbData->id?></a><br>