Problem when i try to share the homepage on Facebook

hi
when I try to share my website on facebook (site made last version about John template) appear on a post a gray image and this text "Future Artifacts Lorem ipsum dolor sit amet, consectetur adipiscing elit. Mauris vitae metus est. Etiam id dapibus nulla. Duis sit amet odio id risus tristique ullamcorper..."

See print screen below


The website is http://www.martarapallini.it/
How can i resolve it?

Fb has cached data while you were changing the site.
Description should be fine right now. You can always try facebook debugger (search for it in google) an scrap new info.
Also please try this plugin:
http://extensions.joomla.org/extension/phoca-open-graph
as it helps to set og tags supporting fb.