Google Talk replaced by Google Hangouts
2012
On April 20, 2012, Google announced that it was shutting down the mobile web app for Google Talk.In June 2012, Google announced that they were planning to revamp the chat experience by merging Google Talk with Hangouts and Google Messenger to reduce confusion and fragmentation.2013
At the Google I/O Conference 2013 Google announced that they were replacing Google Talk, Google+ Messenger and the original Google+ Hangout video chat service with Google+ Hangouts.On May 15, 2013, Google's manager of real-time communication products, Nikhyl Singhal, stated at Google I/O that the move to Google+ Hangouts would mean that XMPP (the protocol that allowed Google Talk to interoperate with other vendors and applications) will not be supported in Hangouts. Mr. Singhal stated that as long as Google Talk was available, 3rd party clients could be expected to continue to work.
substituted by superseded by succeeded by followed by replaced with