Snapchat’s lackluster ad business threatens $16 billion valuation

By Heather Somerville SAN FRANCISCO (Reuters) – Snapchat, maker of a free mobile app that lets users send videos and messages that disappear in seconds, is struggling to gain traction with advertisers, fuelling investor concern that its $16 billion valuation isn't justified by a business that hasn't yet shown it has a steady source of income.

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