Facebook is testing a new WhatsApp button in its main app Facebook appears to be running a trial that features its subsidiary WhatsApp a lot more prominently in the main app. Users are reporting seeing a dedicated WhatsApp button in the main Facebook app on Android . When clicked, the button acts like a shortcut, opening WhatsApp without the need to leave the Facebook app. TNW has since obtained images of the feature. Here is how it looks: In case you were wondering, the dedicated button can be found in the menu area. If you happen to be one of the users in the control group, it should appear at the top, right under your name. But chances are not everyone will be able to see it yet. The shortcut is currently being tested on the Android version of the app, but it could very well be available to some iOS users too. According to Arvind Iyer, who tipped us off to this development, the WhatsApp button showed up after he switched Facebook’s language ...