[_hzw]

I will let users decide whether they want comments or not. I've also considered public/private notes, as I am working on something similar, and I've reached the conclusion that people post on a web app because they want to be seen; otherwise, they would just write in their diary. Private notes always give me a sense of false privacy, as anyone with admin access to the database can read whatever private things you've written, unless you make it clear to users that "private" means not viewable by other users but not private from the admins. An alternative is to offer an offline app, private notes never sync to the server (cross-device syncing can be done by iCloud, for example).