WhatsApp's claim to fame originally was its ability to run on virtually anything, including the J2ME phones popular in the US and Europe in the mid-2000s.
I'm not so sure about that. ICQ had a J2ME client before Whatsapp. The unique feature it had at the time was how easy it was to set up - it used the phone number and IMEI to authenticate, no user name or password to remember, and the contacts in the phone book automatically become Whatsapp contacts.
Language exchange is one of the most obvious uses of videoconference over the Internet; it's been done ever since broadband (basically anything faster than dial-up) Internet access was widely available, with plenty of sites devoted to that purpose.
Is it news because it's about elderly Americans and young Brazilians? This is more like an unabashed slashvertisement.