Your journal is yours, you do what you want with it. I have one concentrating specifically on TV and movies. Make it as interesting as you can and as different as you can if you want lots of views and comments. But other than that, make it about whatever you want and include whatever you like. See also the Batcave for more ideas on how varied/strange a journal can be.
Welcome to the journals section, and watch for your name in the weekly update post tomorrow in the "Announcements" subforum.