Flickr Pro in my opinion is a wonderful site to showcase my professional photos and be seen around the world by adding images to groups. My following has grown fairly well in 3 years. My college teacher recommended it for his students to add photos for his course in a group (members in this specific group are only classmates) which was a great idea. The pro member account is not expensive and it has great analytics for this to help you rate your own work and see which photos excel and why. Many of the world's best photographers are on this site. Those few complaining in reviews need to remember only to post their best work (not everything) and use the site properly as recommended to see results. Highly recommended for the free or pro account. Send links of your own work (copy the line from top address bar) to clients to use it as a portfolio showcase. People have to remember to do their own marketing to sell their work and have their photos on multiple sites, and Flickr Pro is one of the best to choose. Have your photos on Flickr and also your website also is recommended for success.
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Flickr is almost certainly the best online photo management and sharing application in the world. Show off your favorite photos and videos to the world, securely and privately show content to your friends and family, or blog the photos and videos you take with a cameraphone.