And Google+'s Hangouts. And Skype's IMs. And tweeting to each other can also be seen as chatting. I'd say the biggest chance is the fact that all of them are w

And Google+'s Hangouts. And Skype's IMs. And tweeting to each other can also be seen as chatting. I'd say the biggest chance is the fact that all of them are web-centric or mobile-centric.