Finding Similar websites or any related information not only keeps you updated with more information but also helps you find alternative for your need. Google Similar Page is one such add-on for Chrome which finds similar page with respect to the current page you are on.
Like you can see in the above snapshot, I tried finding similar sites like Photo bucket, which is image hosting service, and I had options of Flickr, Image Shack, Tiny Pic and Shutter Fly. Just download this extension from here and start finding alternatives.