Weary of noisy social networks filled with mundane updates from the most remote acquaintances, millions of people have turned to their smartphone address books - and the diverse array of messaging services that rely on them, like Snapchat, Secret, Kik and WhatsApp - for more intimate social connections. Now the stampede toward those messaging services has Silicon Valley's giants scrambling to catch up.Being able to tap into this address-book messaging is a major reason why Facebook decided that WhatsApp, the most popular of...
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