WhatsApp is one of the most popular messenging services on Android and since Facebook has bought the company they are trying to use it to take over messaging on mobile. They've pretty much accomplished that and now have moved onto the desktop with applications for both Windows and OSX platforms. They want to know it all - as there is a lot of money to be made spying on people.
About 16 months after making its messaging service available on the web, Facebook-owned WhatsApp is coming to the desktop. The company said today that its apps are now available for Windows 8 and above, and for Mac OS X 10.9 (Mavericks) and above. That's in addition to the existing apps for Android, iOS, Blackberry, and Windows Phone, among others. "Like WhatsApp Web, our desktop app is simply an extension of your phone: the app mirrors conversations and messages from your mobile device," the company said.