Double name display in activity stream

When displaying my status updates in the activity stream, my name appears twice. First as my username on the site, then as my FB-name. It looks something like this:

"Janne Jan Kjellin thinks he's seeing double"

I've managed to remove my site username by deleting $name from the line return '<span class="activitystream-item">'. theme('activitystream_facebook_icon') . " <span>$name " . l($node->title, $activity->link) ." <span class=\"activitystream-created\">$date</span></span>". l('#', 'node/'. $node->nid, array('class' => 'permalink')) .'</span>';, resulting in messages like:

"Jan Kjellin is rather content"

However, I'd like to remain a bit more anonymous (albeit not entirely, of course), given some of the topics I discuss on my site, so the perfect solution would be to remove "Jan Kjellin" instead of "Janne". But that info is of course integrated in the Facebook feed. What I want to know is if there's a way to remove the name via the code for the module? Some sort of "do not post these two words"-line or something?