I use journals when I'm bored just to give myself something to do. Write about your day, your life, rants about things that irk you, a funny event that happened in your day, a good story you read; the list goes on. Journals are a great way to get to know the writers of Mibba. I've made so many friends through them--it's awesome.
Journals are probably the most addicting part of this site. Trust me. :)