I wish to create a web app using WordPress. Each user will sign up using username/password (as usual), and all will have access to the home page and certain categories. However, I want my users to also be able to create their own, private posts... visible only to the individual user and no other users, and this needs to happen automatically. Is this possible to do in WordPress, and how would I make this happen? Do I need to use BuddyPress? (I have no site set up yet, as I need to know if this is actually possible to achieve in WordPress). Thanks in advance for the help!