Hello and welcome to the forums You need to be friends with a person BEFORE you can send a mob request... here is the Facebook Specific Add me thread where you can post your adds: http://forums.kanoapps.com/showthread.php?6697-Facebook-Add-Me-Thread Be sure to post your Facebook profile ID, instead of your game profile link.
there is a Add Me thread already please use that http://forums.kanoapps.com/showthread.php?6697-Facebook-Add-Me-Thread&p=78519#post78519