Secret psyops JTRIG group (part of the GCHQ), as revealed byEdward Snowden.
https://en.wikipedia.org/wiki/Joint_Threat_Research_Intellig...
Presentation Slides
https://theintercept.com/2014/02/24/jtrig-manipulation/
Very wide breadth and depth of the tooling used by JTRIG
https://www.schneier.com/gchq-catalog/
The Gentleperson's Guide To Forum Spies (Encyclopedia Esoterica)