Social Sharing by Default in just few categories

Hi There, in our project we have public posts and private posts, also we use social sharing to facebook and Likedin, so every new post or edit post is shared in those social sites, but we dont want to share everything, just want to share the public posts in fact, so is there a way to specify witch category will shared in socials sites and witch will not?

With Best regards
Bruno Alecrim