Facebook is currently the number one social network in the world with somewhere in the neighborhood of 750 million active users. If you’re trying to build a community on your portal, you don’t want to neglect a bridge to nearly a billion possible users. With that in mind, Liferay provides a few easy ways for you to integrate your portal with Facebook.
Like many web sites you may visit, any portal running on Liferay can be set up to use Facebook for sign in. This makes it easier for users to sign in to your site, since they won’t need to remember another user name and password, For more information on setting up Facebook sign on, see chapter 15.
You can add any Liferay portlet as an application on Facebook. To do this, you must first get a developer key. A link for doing this is provided to you in the Facebook tab in any portlet’s Configuration screen. You will have to create the application on Facebook and get the key and canvas page URL from Facebook. Once you’ve done this you can copy and paste their values into the Facebook tab. Your portlet is now available on Facebook.
This integration enables you to make things like Message Boards, Calendars, Wikis and other content on your portal available to a much larger audience (unless you already have a billion users on your site, in which case, kudos to you).