I want you to look at that link and bookmark it. Archive it if you're particularly worried about it going down the Memory Hole. It is important to note the links to the UK's GCHQ agency and their involvement in the same sort of shenanigans that the US's NSA is now known to do thanks to Edward Snowden, but I want you to scroll down and start reading the body of the page. I want you to read the techniques for online information manipulation and control with an eye to the forums, subreddits, blogs, comment sections, etc. that you frequent (or did in the past) and see if you recognize any of them being used.
I do. You see, this is not just something political campaigns do, but rather something that other interested parties--some of whom are not paid to do it--employ, such as the Social Justice cult. They do it for the same reasons that their counterparts working for real power players do: to take and wield real power. Influence is not something to laugh off; if you're not actively defending your brain via critical thinking (i.e. the Trivium Method), then you're vulnerable to being influenced in this manner.
These are tactics. They are used to pursue a strategic objective. That objective has to do with logistics, specifically denying the use of media by opponents--that would be us--to contradict and destroy the Narrative. Narrative Warfare is about information, and so it is not surprising at all that there would be techniques intended to manipulate what information is received, where, when, and how. (We already know why.)