something strange in thumb image in sharing to facebook

[fuchsia555]

Hello everybody
i have a strange problem
that i have already inserted the two ways that facebook can get the thumb by them

<meta property='og:image' content='thumb.jpg' />

<link rel="image_src" type="image/jpeg" href="thumb.jpg" />

but i see that works fine with some posts and others NO

for example :
in these posts
http://videos.play35.com/kamera-e-fs...candid-camera/ ( WORKS FINE )


http://videos.play35.com/tricked-by-...per-heavy-box/ ( doesn't work , it gets any thumbs


any suggestions ?
Thanks

[omerbutt]

both of these pages are generating thumbs properly i am watching in firefox