also, another new feature that you can create is the fan club feature that they have on there for celebrities. You can basically join a “fan” type group to show that you are a fan of that particular celeb.
Basically, let’s say if your portal is freebets.com or something, you can create a page dedicated to that portal on facebook, and invite people to become your websites fan. This will in turn drive more traffic to your site as the word gets out across the network and you get more fans