Sharing buttons can also be enabled and disabled on individual posts, in addition to changing the default settings for the blog as a whole. On the post you mentioned at http://crisuadi.wordpress.com/2014/07/12/hollywoodland/ the sharing buttons are disabled.
You can enable sharing on specific posts that are already published, like that one, by editing the post. In the "Likes and Shares" module, you can check the box next to "Show sharing buttons." We have more about that here: http://en.support.wordpress.com/sharing/#disabling-sharing-on-specific-posts
Please let me know if I can do anything more to help with that. :)