Contacts + social media = the future
Contact management and social media are becoming increasingly entangled as people self-publish personal data on the web. Cobook intelligently coordinates your contact book (organized the way you like it) with data pulled from social media sites (Facebook, Twitter, and LinkedIn--organized the way your contacts like it). There are other apps that do this, but Cobook wisely places your contact book (thereby preserving _your_ preferences) at the center of things instead of just aggregating all everything willy-nilly. Cobook is still improving, but even now its the best contact management app in the store. Ive tried most of the extant contact apps, and Cobook is not only the best available, its got the brightest future. I recommend it to everyone I know.
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Contacts+ | Address Book, v2.3