Richy,
Generally, for multi-lingual sites, you would have one article for English and another for Italian. If that's the case, you'd use the same {SCOpenGraph .. } type tag in each article using the proper language for the article's language.
If that's not what you're doing, please explain how you have multi-lingual setup on your site as well as the two URLs for an article in both the English and Italian versions so that we can see more about how the front-end of your site works.
Thanks,
Alex