Lots of people have started to upload and share images on the Pinterest.com web site where it is possible to pin images for future reference and to share favourites.
What might be a concern for those whose photography is their only or main source of income is the following clause in their terms and conditions.
Member Content
We may, in our sole discretion, permit Members to post, upload, publish, submit or transmit Member Content. By making available any Member Content through the Site, Application or Services, you hereby grant to Cold Brew Labs a worldwide, irrevocable, perpetual, non-exclusive, transferable, royalty-free license, with the right to sublicense, to use, copy, adapt, modify, distribute, license, sell, transfer, publicly display, publicly perform, transmit, stream, broadcast, access, view, and otherwise exploit such Member Content only on, through or by means of the Site, Application or Services. Cold Brew Labs does not claim any ownership rights in any such Member Content and nothing in these Terms will be deemed to restrict any rights that you may have to use and exploit any such Member Content.
Now I’m no legal expert but that sounds to me like something of a rights grab even though they don’t claim any ownership.
So if you use Pinterest and upload images make sure that you are prepared to lose control of their distribution and are quite happy for someone else to sell them.