As per reports, WhatsApp users within an hour started posting tweets that the service has been restored.

Users also reported one such blackout earlier this week. The previous outage happened on the same day when the app claimed that they catered to record number of messages.

It stated that the app has managed to accommodate 20 billion sent and 44 billion received messages in mere 24-hour time period.

Facebook has bought WhatsApp for USD 19 billion. Facebook is betting huge on mobile with the eye-popping cash-and-stock deal for WhatsApp, which was only started five years ago but has quickly grown as a free alternative to text messages.