I personally use LiveJournal, and have for years. It's pretty easy to just make an account and post with the default settings, but they also have about a million and a half different things you can change to completely customize it as much as you want (free accounts have less options to change, and then there are "Plus" accounts if you let them put ads on your blog which give you more options, and then regular paid accounts get the most).
LiveJournal.com - Start a Free Blog / Journal Today 
