How to write an entry for specific groups of people only in LiveJournal


 * 1) Register with LiveJournal, if you are not already registered.
 * 2) Login to LiveJournal if you are not already logged in.
 * 3) If you want to post to a community blog, join the community of the blog first.
 * 4) Create your groups (1-time procedure)
 * 5) Go to the update page (Journal > Update) or just follow the link http://www.livejournal.com/update.bml
 * 6) Change the Security: select box to "Custom.."
 * 7) Select the groups you want to post the message.
 * 8) Press the post button. (NB: don't forget to choose the journal or community you want to post to)

From HowTo Wiki, a Wikia wiki.