Instagram, which has over 400 million users globally with 75 percent of its userbase outside the US, does not give country-specific user details.

"Instagram has gained immense popularity and people are using it to express themselves. Our monthly actives in India have more than doubled over the past year (as of September 2015) and the momentum continues to build," Facebook India MD Kirthiga Reddy told reporters here.

In India, 18–24 age group is the most active on Instagram, she added. Instagram has grown to more than 400 million users this year and among the last 100 million to join Instagram, more than half live in Asia and Europe, Reddy said.

Instagram commissioned a study to understand the usage pattern in India and found over 90 per cent of its users in the country to be under 30 years of age.

In India, advertisers on Instagram include P&G, Nestle, Paper Boat, Grofers, TrulyMadly Matchmakers and Sportskeeda, among others.