If you ever have a friend on your friends list threaten suicide or leave a suicide not in their LJ (public or friends only) contact the Livejournal Abuse Team immediately.
The Abuse Team does have more info on each LJer than most of us may have and can contact the users local police department and get them help a lot sooner than an LJ friend could if no one knows his real name or address... Abuse team handles these situations frequently.
jessical, a member of the LJ abuse team says: file a request with the LiveJournal Abuse Team with *all* IRL contact info you have". Sometimes people forget to do that, and in suicide requests, seconds count. ( how the LJ abuse team responds )
Unfortunately, it's not uncommon that people leave suicide notes in their LJ, but very few LJers know to contact the Abuse team in the event that someone on their friends list leaves a suicide note... can you each take a minute today to post this info in your own LJ to spread the word throughout LJ as for how to handle this type of situation. like jessical said, "seconds count" and contacting LJ abuse for a friend is what may may save the life of someone on YOUR friends list.