What worries me is if Facebook has or hasn't studied how someone might react to what they may see as being informed upon? They might actually wind up pushing someone over the edge. Looking at that interface I can see that this feature could be abused: A bully use this as a way to threaten someone.
And on larger level there's something worrying about Facebook holding that data over your lifetime. What if on a future date Facebook shares that information at some future point with potential employers or law enforcement officials? Or what if Facebook is hacked and this data is put into the public.
"...partnering with Now Matters Now, the National Suicide Prevention Lifeline, Save.org and Forefront: Innovations in Suicide Prevention, a nonprofit operating out of the University of Washington's School of Social Work"
So I'd guess that the messaging and interaction has been thought through pretty clearly to be effective at best and harmless at worst. That's a solid lineup of consulting partners for a feature like this.
But are they the best partners? For example the National Suicide Prevention Lifeline may really get phone interaction better than anyone else, but that's different than social media in terms of interaction from a users point of view.
This is really a different medium, and one that may generate false positives just for starters. So it may not be harmless because you could alienate a false positive, or abuse it to bully someone.
And I'm basing this as an interaction designer on just the few screens that I see there (so if I'm seeing that, what else is being missed?).
And on larger level there's something worrying about Facebook holding that data over your lifetime. What if on a future date Facebook shares that information at some future point with potential employers or law enforcement officials? Or what if Facebook is hacked and this data is put into the public.