New York - WhatsApp, the messaging network for smartphone users bought days ago by Facebook for $19bn, went offline for several hours on Saturday.
The WhatsApp Twitter feed let users know: "Sorry we [sic] currently experiencing server issues. We hope to be back up and recovered shortly."
About three hours later it tweeted: "WhatsApp service has been restored. We are so sorry for the downtime."
The WhatsApp Status feed also shows that the app experienced an outage on Friday night and that it was down seven times in the last year.
Users of the globally popular smartphone messaging application reacted to the service failure with sarcasm and rancor.
Some suggested Facebook bought the company just to shut it down. One user said he also would feel "down" after being bought by Facebook.
Another showed a picture of a frustrated WhatsApp user in one frame asking where the service was and another frame showing the two newly rich co-founders of WhatsApp and the caption "We're in the Caribbean bro".
Some blogs speculated that the outage was the result of people looking up and downloading the app following the wave of publicity generated by the acquisition, according to Cnet news.
Facebook paid $12bn in shares and $4bn in cash, the company said on Wednesday.
The deal includes an additional $3bn in Facebook stock for WhatsApp founders and employees.
The deal should close later in 2014 and is still subject to regulatory approval, according to Facebook founder and chief executive Mark Zuckerberg, who said he did not expect any issues.