Perdonad que me meta en el interesante debate, pero ojo con usar ese servicio... leyendo los terminos de uso, les das permiso para que hagan lo que quieran con las imagenes o lo que subas, incluido venderlas....
"
7. CONTRIBUTION LICENSE
By posting your Contributions to any part of the Site or making Contributions accessible to the Site by linking your account from the Site to any of your social networking accounts, you automatically grant, and you represent and warrant that you have the right to grant, to us an unrestricted, unlimited, irrevocable, perpetual, non-exclusive, transferable, royalty-free, fully-paid, worldwide right, and license to host, use, copy, reproduce, disclose, sell, resell, publish, broadcast, retitle, archive, store, cache, publicly perform, publicly display, reformat, translate, transmit, excerpt (in whole or in part), and distribute such Contributions (including, without limitation, your image and voice) for any purpose, commercial, advertising, or otherwise, and to prepare derivative works of, or incorporate into other works, such Contributions, and grant and authorize sublicenses of the foregoing. The use and distribution may occur in any media formats and through any media channels.
This license will apply to any form, media, or technology now known or hereafter developed, and includes our use of your name, company name, and franchise name, as applicable, and any of the trademarks, service marks, trade names, logos, and personal and commercial images you provide. You waive all moral rights in your Contributions, and you warrant that moral rights have not otherwise been asserted in your Contributions. [...]"