If you refer to using FB to communicating and looking for old friends, then that's how I use my FB account. If it is the other way, then you need to create your own facebook account by having a valid email.
i use it as communicating to my friend and sharing my thoughts and keep in touch to them.. and sometimes when im bore i play to fb games.. like cafe world.. and sometimes i love to answer to the quiz !! :)
I use my facebook account in communicating with friends who work or stay in other countries and also updating online friends. I also use y facebook account in playing farmville once I'm quite bored with other sites.