Hi all,
I found out recently that shutterstock had a separate affiliate account..
affiliate.shutterstock.com instead of the usual contributor account.
It seems like showing more information about affiliate, and one can even know who is your referred members. I think it is useful for blogger or buyers who aren't interested to contribute images, without interface of submitting images.
the above link is a referred link. If you are a contributor then you can login with same username and pw too.