WhatsApp, Instagram, Facebook and Facebook Messenger are currently reporting issues with the apps on Android, iOS as well as PC., users reported on Monday evening.
All three apps are owned by Facebook and run on shared infrastructure.
"Sorry, something went wrong. We're working on it and we'll get it fixed as soon as we can," a message on the Facebook website said.
WhatsApp acknowledged the outage on Twitter:
Users posted messages on Twitter saying the popular social networking and communication platforms were inaccessible from around 9 pm Indian time.
According to the tracking website DownDetector, more than 13,800 people have reported issues with WhatsApp. As for Instagram and Facebook, over 11,300 and 2,500 reports have been registered so far, respectively.
Meanwhile, the social-media giant's instant messaging platform WhatsApp was also down for over 14,000 users, while Messenger was down for nearly 3,000 users.
All three Facebook properties are market leaders in India in their categories of instant messaging, photo sharing, and social networking.
Facebook has more than 410 million users in India, and its WhatsApp messenger counts the country as its biggest market with over 530 million users. Instagram has over 210 million users in India.