I wonder if all message boards go through this and, also, if each poster has a similar experience.
For example: I used to post on a board because it was about something that interested me.
It had been going for some time and had expanded a lot.
I lurked for ages and thought I knew the mores.
It was quite a scary experience posting for the first time and, when I did, I was absolutely taken apart by a Well Respected Poster of Long Standing.
However, I persisted and eventually became a bit of a recognised poster myself.
We had Meets. We had a virtual Secret Santa (I can't work out whether the Christmas Present was virtual or not?).
Then the whole board changed abruptly with an influx of posters from another board which had been summarily shut down but was very different from the original board. However there were points of similarity.
Don't know how to explain this, but imagine a board devoted to Sherlock Holmes books suddenly taking on board everyone who likes any detective television programmes.
The downsides were that there was a huge influx of trolls; we old posters were now small fish swimming in a big sea; there seemed to be a dip in intelligence levels (sorry. I know how that sounds).
Then that board closed.
I started lurking on Mumsnet.
And my experience has been exactly the same.
There are still Well Respected Posters of Long Standing.
Newbies are treated with suspicion.
There are definitely cliques. Any thread about the duchess of Sussex, for example, attracts the same people both pro and anti cliques and one particular group try to copy the posting style of the group leader.
However, I suspect that the internet has grown so big that the cosy message boards that used to exist won't ever return.
People stay the same though and the same dramas are acted, albeit on a bigger stage.