Google Keep has proven to be a popular app in the productivity realm, letting users put down impromptu thoughts or create to-do lists on the fly. Now, however, not only can you share them with others to view, you can collaborate on them in real-time – so if you and your other-half use shared shopping lists, for example, you can see items being scored off in real-time. The feature will be hitting the Android app today, but is already available on the Web and the Chrome app incarnations.     This brings Google Keep into line with other similar productivity apps,…

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