Despite Lightroom mobile's editing features, it's important to keep in mind that the iPad isn't a color-managed device. If your projects rely on a high degree of color accuracy, you'll want to do your finishing work in Lightroom desktop using color-calibrated equipment. For most people, I don't anticipate this to be a problem, but some pros require finer precision that the iPad can't provide.
One editing area Lightroom mobile is currently lacking is user-specified metadata. You can flag a photo as a Pick or a Reject (or leave it unflagged), but that's it. Titles, captions, keywords, ratings, and color labels must be handled in Lightroom desktop.
Sharing with the world
Lightroom mobile can share images via any of iOS's core services, including Messages, Mail, Twitter, Facebook, Flickr, and AirDrop. A slideshow feature is also built-in, which turns the app into a spontaneous portfolio.
Adobe is also introducing Lightroom Web View, which makes your synced collection available on the Web. The implementation is pretty bare-bones, offering only the ability to view photos or play slideshows, but it's an easy way to share a group of photos without exporting and publishing them online via a social service like Flickr or 500px.
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