polyvore problem

i've gotten several tips from some kind people recently
(twice just today) about copyright violation of artists' works
on polyvore.com.

it's basically collages of photos, which unfortunately include artist's
works found around the internet.
(creating things like these with my works, for example).

i didn't really know what to do or feel about it,
since it seemed somewhat harmless, and they had links
back to the original source...

but now, i'm a little put off now it's said that they're going to have
a print feature and make profit off these collages.

artist art & ghosts has more details on this matter here, and here as well.

you can sign the petition against them here.