For all the amazing work and achievements Google can credit itself in the tech realm as a whole, there is one area which has seemingly and rather inexplicably always eluded the online giant. Social efforts in all shapes and forms, including messengers and the infamous Google+ have always been a weakpoint in the chain and the current situation isn't really that much better. Allo and Duo seem to be center-stage in the IM package Google is currently trying to push to end users. Thus, Hangouts' faith is still quite uncertain and while Google is sticking to its promise not to retire it,...
Source: http://www.gsmarena.com/google_is_pulling_the_plug_on_the_hangouts_api_and_thirdparty_app_support-news-22609.php