In the current version (1.0.5) Fuji does not have the social sharing as a built-in functionality. I am planning to add this feature in the 1.1 version which is due any time now. My upcoming themes will have this by default at initial release stages. Meanwhile, I can suggest using one of many available third-party plugins for social sharing; my favourite is this one: http://wordpress.org/extend/plugins/social-linkz/.
If you have more questions, do not hesitate to ask!