The move is seen as part of Facebooks monetization efforts for WhatsApp.
Around monetization plans for WhatsApp, we already announced that we are going to be putting ads in Status.
These are only visible to people in the users contacts.
At the time, WhatsApp also said it would remain ad-free.
Facebook has been planning to monetize the popular messaging service for a long time.
It will also help users understand and participate in businesses using the messaging app.
Also, there is no clarity on how the ads will function on WhatsApp.
source: www.techworm.net