Messaging Startup to Operate Independently, Retain Brand, Facebook’s $19 billion purchase of the WhatsApp mobile messaging service ranks as the largest-ever purchase of a company backed by venture capital. Facebook Inc. FB +1.13% agreed to buy messaging company WhatsApp for $19 billion in cash and stock, a blockbuster transaction that dwarfs the already sky-high prices that other startups have been able to recently command. The 55-employee company, which acts as a kind of replacement for text messaging, has seen its use more than double in the past nine months to…
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