In reply to john arran:
> I read recently that bots are now better at completing Capcha tests than are humans!
There's an arms race between spammers and defenders. It used to be that bots were dumb, so setting a simple JavaScript challenge like 2+2, would stop them. Now, some bots will be able to answer the many background challenges, before you get to the 'how many motorbikes' pics. The cat and mouse has matured to include humans in the chain. There is an example in the link. It seems like a nice work from home job.
https://www.f5.com/company/blog/how-cybercriminals-bypass-captcha
Why are ukc being targeted?
Different resources have different value to the spammers. FB, Twitter, insta accounts are cheap as chips. Resources with different audiences are ratted according to potential impact. So a global audience, with a lot of different professions, different levels of professional etc might be more useful in spreading certain styles of content than others.
Who is doing it?
Every person and their dog, the barriers to entry are pretty low. Viral marketeers, hyping product, would be the bottom branch. Going up to paid for influence / disinformation campaigns. With state sponsored campaigns at the top.
Why?
We saw with Trump, it was far cheaper and more effective to elicit regime change, via facebook than other methods. Normally overthrowing a government and installing a favourable leader, might involve tanks on the street and such. I expect that certain celebs, will be looking at damage limitation etc. In order for these campaigns to be successful, you need the infrastructure in place. Embedded accounts, across a multitude of platforms, with trust in place and ready to go. You cant take a month to spin up 30K accounts, if you need to react to a breaking story.