
Any suggestions for getting that domain removed or otherwise changed? I'm currently looking for a nice generic domain that I can put in my tracking so it's less ugly.
I havent been using Facebook advertising for 6 months now, but when I was, it was possible to edit the shown URL through the power editor, when creating the post/ad.
You can edit it in power editor and can set different display URL 
In the power editor this is the "caption" or "display link" part when making a page link post. Easy fix :-)