Write and send messages to your friends and contacts from your iPhone.
The massive hack has raised questions about First Amendment rights, privacy and cyberwarfare. But there's a subtler issue at play when we look at all the news stories that have come from hacked inboxes: Why do we put this stuff in email?
Aimed at people in West Africa, the BBC will use the popular messaging app to provide updates about the spread of Ebola.
Mark Zuckerberg says he's not yet sure how he plans to see a positive return on his massive investment in the messaging service.
The closing of the deal follows last week's regulatory approval from the European Commission.
With FTC approval granted in April, the approval in Europe means the deal should finally wrap up soon.
In the six months since Facebook announced it was buying the messaging app, the service's monthly active user base has grown by 150 million.
Though you only get a few extra useful features, WhatsApp Messenger is an excellent choice for sending free texts across platforms, even internationally.
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WhatsApp went down for a couple of hours last night, and Facebook apologised just days after buying it.
As the acquisition draws to a close, co-founder says company is most concerned with growing its user base and engagement and would be happy to just break even.
Facebook wants European competition watchdogs to investigate its $19 billion acquisition of WhatsApp in a bid to head off future antitrust problems.