Question about Journal Community etiquette. (Warning: discussion of suicide)

[primeideal]

So, uh, I tend not to subscribe to individual journals on DW/LJ with openID. But I read them! Normally by going to the friends/subscribers page of a community I'm interested in/a member of, and just sort of scanning through, to get a glimpse of who are the people interested in the same things as me, what they write about, yada yada yada.

So, as part of this normal browsing routine, I run into someone I've never interacted with before who is posting some seriously suicidal-ideation stuff. And, growing up you learn in school that, if someone seems suicidal, you contact their parents or the authorities! Except, we're young adults here, I have no idea who this person is and it seems to be not my place to intrude, it's not even like we have any mutual friends I can nudge and go "hey"...so what do I do? Just walk away?