I'm starting a web app that would function as a private space. Something like a combination of the facebook wall where you can post stuff that you want to remem

I'm starting a web app that would function as a private space. Something like a combination of the facebook wall where you can post stuff that you want to remember, a journal, notes, to-do's, calorie counter plus some more stuff. It will be modular so you can add the stuff that you want to use and remove those that you don't use.