Well technically my journal is partially friends only...
If you are my friend and I don't have you on my friends list leave a comment on this entry letting me know who you are and how I know you (it will be screened) and I will add you to my friends page.
If you can see an entry on my journal feel free to comment on it. They're marked as public for a reason. Not all entries have the comments screened so remember others can see what you write.