I know ideally it's best to contact the authorities or local helplines, but in general a person will seek out their community first. One of the private groups I'm a member of on here has a Support Buddy system - a sticky post that the regulars are on, so if you are worried about a particular member you just look at this sticky, and find out who has their number. Then you can contact that member, and they will check on the person. This has been absolutely fantastic just from my experience, rather than putting a message in the messages forum that they probably won't see, you can get some help to do something proactively. I'm not in regular contact with the girls over here, and there are other members who are overseas or in rural areas where they don't have another member just around the corner, so exchanging numbers or email address has been very helpful.