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Facebook has introduced a service that allows users to report friends who have posted suicidal content on their account pages.
The Report Suicidal Content form, asks for the URL where the comments were made, the user's full name and other information. From there, “A Facebook administrator will review your report and take any available action from our end,” although the social network doesn't say exactly what that means.
Only once, years ago, did I have someone actually making significant noise about ending their life. It's not pleasant trying to make things better when I have absolutely no qualification for that kind of thing.