Facebook-owned WhatsApp, the mobile messaging service it paid $19 billion for two years ago, now has a desktop app, too.
Ironically, Facebook is running in the opposite direction, with the bulk of its business now coming from mobile. But there might be a good reason to further push WhatsApp, which has a billion users, onto people's desktops. (WhatsApp already offered a desktop feature, just not an app.)
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The key motivator: it allows people to continue conversations they start on their phone even if they switch devices. That's useful, and something that Google and Apple also allow with Hangouts and iMessage respectively.