eWeek: A new Facebook button may soon be popping up on the websites you visit. Similar to the ubiquitous "like" button, the "share" button will allow users of the social networking site to send links to their friends. However, while the "like" button sends links to all of a user's friends, the "share" button only sends the link to members of a specified Facebook Group.
More than 50 sites, including The Wall Street Journal, The Washington Post, Orbitz and Gilt Groupe, are currently testing the new button.