Yes I have. the worst being a relationship breakup with a very small child involved. There was talk of ending it all then the account went silent for weeks. In the end he pulled himself back together. Haven't heard from him in ages now though. Hopefully everything is good.
I have when I felt they were going through something - You felt there was a change in their posting style and either through direct reference in a post or the need to send a PM, you had to try and find out what was going on plus if they wanted/needed help.
Yes a few in fact. Some I've tried reaching out to from their comments to find those comments were deleted before I had a chance to reply to them. It's not my place to say but I'm not so sure deleting their comments so quickly is a good idea because that eliminates reaching out to them. Again not my place or decision but it is aggravating because I'm not able to offer help and I don't know if they may have hurt them selves or not. Then aside from everything else in my life falling apart around me I get that on my mind too lol
I dont have gag friends but I've been worried about other online friends. I had friends who were suicidal and sometimes they told me they were about to kill themselves or something and i always freaked out..
I have for their physical and mental health. I also worry about how well they're doing in life because I don't want them hurt. I'll never say to someone face though because I'm a tad too cold hearted for it.