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Flickr - The former photo king makes a comeback - Free
I used to use Flickr religiously - before photo sharing was even a thing. Unfortunately, like many things at Yahoo!, Flickr was left to whither and die. The new Flickr for iPhone (free, App Store) is a complete rewrite that's nothing short of amazing. The new iOS app features better-than-Instagram filters, editing tools and a copious amount of sharing options. Plus it's great to just browse photos. The new Flickr is so good that I renewed my Flickr Pro account and I'm seriously reconsidering my Picasa Web Albums renewal. I can't wait for the universal version of Flickr for iOS so that I can use it on my iPad.