WhatsApp the messaging service that is now worldwide said it would begin sharing phone numbers of its users with its parent company Facebook.

That move means that WhatsApp user will likely start seeing targeted ads soon along with friend suggestions from Facebook, although they will appear on Facebook and not on the actual messaging service.

This move is very subtle but a shift with significance nonetheless for WhatsApp, which now is used by over 1 billion people worldwide.

When Facebook acquired the company for $21.8 billion just two years ago, WhatsApp executives promised that privacy would remain safeguarded.

This is a tactic by Facebook that can only be called strong-armed, said the executive director at the Center for Digital Democracy Jeff Chester. They continue with their campaign of running roughshod over the privacy rights of users.

It was announced that users of WhatsApp have been given a short time to opt out of having their information shared with Facebook, although an extra step must be taken of going and unchecking a box. It also said that Facebook will not give the phone numbers out to anyone and will not post them online

However, the giant in social networking has looked for new ways to make more money from the messaging service since it acquired it in 2014.

Facebook has also pledged to not interfere with a promise by the co-founders of WhatsApp to respects the privacy of owners and to keep their ads off the messaging platform.

On Thursday, WhatsApp offered a small glimpse of plans it has for making money, releasing new documents which describe the privacy policy of the company and terms of service uses must agree to in order to use it.

The documents represent the first revision of policies in four years, which was prior to when WhatsApp was acquire by Facebook.

One change was hinted at previously by executives at WhatsApp who said they are exploring ways for different business to communicate with their customers on the messaging service.

Companies could send marketing offers as well or messages regarding sales to customers, according to the documents, which say that users would be able to block or filter such messages.

WhatsApp said it would continue to bar the traditional ads from the service.

One other change, which could be even more controversial, is the start of coordinating accounts with those of Facebook through sharing the mobile phone numbers of users of WhatsApp.