It has to be said, they really are appallingly bad - I don't recall 118 making a single valid point to be honest?
To be fair though, not all shitposters are Russian trolls. John G doesn't half post a load of shit too.
As you say, a shitposter can be from any persuasion, be it business, political or whatever.
In the final days before the general election lot of Facebook groups were swamped by an influx of new posters with very strong political views. Those new posters also wanted to post lots and lots of text info or quotes from their favoured party, this stopped any other meaningful discussion.
One of the local sites I use is for buying and selling furniture.
It was suddenly swamped with lots of pro Labour posters saying only Labour could save the country, or that voters who voted Tory or Lib Dem were evil.
While the ‘new’ posters had lots to say and post it was notable that they didn’t have posting histories, photos or timelines and had created their accounts purely for the GE.
What was comical was that many of them referred to the ‘local hospital’ (for the group concerned) and were saying how bad the A and E dept was, or how they had been kept waiting too long in the A and E dept due to Tory cuts.
While their stories were heart warming and a damning inditement on Tory cuts they had made one error.
The hospital they were complaining about doesn’t have an a and E dept, and is purely a community hospital
This occurred in an area with a Tory MP. I’m sure the reverse happened in Labour areas.