fb has a search function to help you find pages or groups that may interest you. for example, search 'belize' and you will find many people, pages (fan sites) and groups related to belize.
to my knowlege, most apps are used just for fun, as opposed to business - things like games, surveys, quizzes, top 5 picks, etc. these can often be accessed using someone else's status updates. for example, if elbert is a friend of yours, and elbert plays bejeweled, when it post on his status, there will be an option to play bejeweled. or simon takes a rock bands quiz and you want to take it too, 'click take this quiz'. if someone pokes you, you get an option to poke back. you have to 'allow' the app to use it. it can later be deleted - app edit is on lower left of page. top page right is 'settings', where you can adjust your privacy too. it isnt that complicated.
does that help?