Instagram now has more than 700 million monthly users, up 200% in two years actives in two years. It took just four months to add these last 100 million. Adding the previous 100 million users tooks 6 months.
Instagram's meteoric growth to 700 million users has been fueled in large part by Stories and other innovations copied from Snapchat. Instagram Stories users passed 200 million last month - 20% more than Snapchat.
Instagram is now also more than twice the size of Twitter. Facebook include WhatsApp and Messenger at 1.2 billion users each and Facebook itself at 1.8 billion.