The software would primarily depend on the Operating System he's running (i.e. Windows/Mac/Android ?), the camera(s) he's using, whether they are looking at free/paid apps, as well as whether the social site/platform is supported by the particular software. These are too many variables to give out a generic recommendation imho. Some of the popular options would be Xsplit (has a free version), "Google Hangouts on Air", Open Broadcaster, among many others I guess.
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