Currently the social sharing buttons are community wide. You turn then on for everything or for nothing. Please do submit in Ideas for Jive - I think many customers would benefit by being able to choose the places where they are enabled. Thx!
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There is an old archived version of this here, Restrict or Display social share icons in specific spaces. So I've re-added, with my use case outlined above inserted as detail, Allow restriction of Social Sharing tools to specific space(s).