For those of you who wants to use imagegen with facebook images I have created a list of all the subdomains i could sniff from their image domain, there might be more but this should get you started :

 

 <Domain>8sphotos.ak.fbcdn.net</Domain>

        <Domain>apps.ak.fbcdn.net</Domain>

        <Domain>com.ak.fbcdn.net</Domain>

        <Domain>creative.ak.fbcdn.net</Domain>

        <Domain>dragon.ak.fbcdn.net</Domain>

        <Domain>external.ak.fbcdn.net</Domain>

        <Domain>hdvideo.ak.fbcdn.net</Domain>

        <Domain>htmlphotos-d.ak.fbcdn.net</Domain>

        <Domain>htmlphotos-g.ak.fbcdn.net</Domain>

        <Domain>htmlprofile.ak.fbcdn.net</Domain>

        <Domain>photoc-c.ak.fbcdn.net</Domain>

        <Domain>photos-0.ak.fbcdn.net</Domain>

        <Domain>photos-a.ak.fbcdn.net</Domain>

        <Domain>photos-b.ak.fbcdn.net</Domain>

        <Domain>photos-c.ak.fbcdn.net</Domain>

        <Domain>photos-d-2.ak.fbcdn.net</Domain>

        <Domain>photos-d.ak.fbcdn.net</Domain>

        <Domain>photos-e.ak.fbcdn.net</Domain>

        <Domain>photos-f.ak.fbcdn.net</Domain>

        <Domain>photos-g.ak.fbcdn.net</Domain>

        <Domain>photos-h.ak.fbcdn.net</Domain>

        <Domain>photos-i.ak.fbcdn.net</Domain>

        <Domain>photos-j.ak.fbcdn.net</Domain>

        <Domain>photos-k.ak.fbcdn.net</Domain>

        <Domain>photos-l.ak.fbcdn.net</Domain>

        <Domain>photos-m.ak.fbcdn.net</Domain>

        <Domain>photos-n.ak.fbcdn.net</Domain>

        <Domain>photos-o.ak.fbcdn.net</Domain>

        <Domain>photos-p.ak.fbcdn.net</Domain>

        <Domain>photos-q.ak.fbcdn.net</Domain>

        <Domain>photos-r.ak.fbcdn.net</Domain>

        <Domain>photos-s.ak.fbcdn.net</Domain>

        <Domain>photos-t.ak.fbcdn.net</Domain>

        <Domain>photos-u.ak.fbcdn.net</Domain>

        <Domain>photos-v.ak.fbcdn.net</Domain>

        <Domain>photos-w.ak.fbcdn.net</Domain>

        <Domain>photos-x.ak.fbcdn.net</Domain>

        <Domain>photos-y.ak.fbcdn.net</Domain>

        <Domain>photos-z.ak.fbcdn.net</Domain>

        <Domain>photos.ak.fbcdn.net</Domain>

        <Domain>platform.ak.fbcdn.net</Domain>

        <Domain>profile-g.ak.fbcdn.net</Domain>

        <Domain>profile.ak.fbcdn.net</Domain>

        <Domain>-external.ak.fbcdn.net</Domain>

        <Domain>s-static.ak.fbcdn.net</Domain>

        <Domain>sphotos.ak.fbcdn.net</Domain>

        <Domain>a2.sphotos.ak.fbcdn.net</Domain>

        <Domain>a8.sphotos.ak.fbcdn.net</Domain>

        <Domain>a6.sphotos.ak.fbcdn.net</Domain>

        <Domain>a4.sphotos.ak.fbcdn.net</Domain>

        <Domain>a3.sphotos.ak.fbcdn.net</Domain>

        <Domain>a5.sphotos.ak.fbcdn.net</Domain>

        <Domain>a1.sphotos.ak.fbcdn.net</Domain>

        <Domain>a7.sphotos.ak.fbcdn.net</Domain>

        <Domain>static.ak.fbcdn.net</Domain>

        <Domain>statik.ak.fbcdn.net</Domain>

        <Domain>video.ak.fbcdn.net</Domain>

        <Domain>vthumb.ak.fbcdn.net</Domain>