Zuckerberg & Co. also revealed that it would allow developers to employ its Save to Facebook button in apps and on the web as well. The button functions in a similar fashion to Pocket's buttons and plug-ins, allowing you to add a link to a collection that you'll read later (in theory). The button isn't new, but it has been limited to saving items from the News Feed. Today's announcement makes it available for any place you consume content, taking aim at services like Pocket. The libraries of saved items are social, yet they're like Pinterest and other read-it-later options, as you can only see your own stuff. It wouldn't be a surprise if that changes in the future, though.