While India has nearly 93 million Facebook users, the count of people using the popular WhatsApp service is around 40 million in the country.

Meanwhile, concerns are already being raised in certain quarters about privacy issues post deal. Privacy groups in the U.S. have asked American fair trade regulator FTC to put the deal on hold and probe how the social media giant plans to use subscriber data.

U.S.-based Electronic Privacy Information Center (EPIC) and the Center for Digital Democracy (CDD) have asked the Federal Trade Commission to investigate WhatsApp and enjoin its "unfair and deceptive data collection practices" for anyfuture changes to its privacy policy.

Announcing the deal to acquire WhatsApp last month, Facebook said it would help accelerate growth and user engagement across both companies.

As per the deal, Facebook would shell out $16 billion, including $4 billion in cash and approximately $12 billion worth of shares for WhatsApp acquisition.

Besides, the social networking major would provide additional $3 billion in restricted stock units to WhatsApp's founders and employees that would vest over four years subsequent to closing.

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