I'm in a FB group for a moderately niche hobby. It's UK based, has about 5k members. The group is specifically about this hobby (a type of craft).
More and more people are posting "Off Topic" (OT) posts, which is pretty frustrating in its own right as if I wanted to read about people's washing machines, husbands, cat sick etc etc then I'd...well, I'd come on to AIBU!
But what's becoming really concerning, is the overuse of the term "Trigger Warning" (TW).
There is now a rule in the group, that if someone wishes to post about a "TW topic" they should post the title, and then put the rest in the comments - so that anyone who could be potentially "triggered" by the content, can safely avoid it.
Firstly - this seems like overkill to me, there's several topics that I avoid because I find them "triggering" upsetting or just plain irritating for various reasons, they reveal themselves in the first sentence or so of a post, so I just close and move on. A daily occurance on Mumsnet really 
But more concerningly - it seems that EVERY topic is becoming a "trigger warning".
OT + TW - Make Up. I'll post in the comments
OT + TW - my Dog. I'll post in the comments
etc etc
Usually I'd laugh it off, but people are taking it so seriously - there was a post the other week about wedding dresses (also not related to the hobby
) and someone went off on one in the comments about how they had just gone through a divorce, and the topic "triggered" them - AND THE POST WAS REMOVED!
We had one woman get really irate and flouncy because someone was talking about makeup - and the flouncer was vegan and very anti-make up, so reading a post about makeup triggered her anxiety and that was apparently the poor poster's fault - again, admin sided on the flouncer and the post was disabled.
It's just become a bit bonkers - the FB page has become more of a mental health forum (lots and lots and lots of posts about people's depression and anxiety etc etc) which may explain why it's a particularly sensitive space, but I'm seeing it elsewhere as well.
I personally feel that - by and large - a person's mental health (in regards to being "triggered" at least) should be, first and foremost, their own responsibility - and that the onus is on them to avoid topics should they find them unbearable, not for the rest of the population to moderate their language so that every possible trigger is omitted.
I'd also add that if just seeing a line about a stranger's dog dying, or wedding announcement or pregnancy is enough to set someone off in a mental health spiral - siginificant medical intervention should be in place and that person should be taking steps to avoid social media.