It is mainly used as an address book for easier communication. Here is official info from Istockphoto:
The Creative Network is a way for you to keep your friends and colleagues on iStockphoto handy and make communication among members easier. Please be judicious in your use of the mass-mailing features of the Creative Network, and avoid excessive sitemailing and frivolous messages. In cases when you find that a user on your CN is abusing the service or using it in annoying ways, please try to contact the user directly to resolve the matter, before escalating the issue to the Site Director. Many disputes or problems can be solved interpersonally and do not need to be aggravated by the involvement of Administration.
You can add any Istockphoto member to your Creative network from their profile page (look for “Add to My Network” link).
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