Same techniques (largely derived from psychology, statistics, sociology, etc) used in social media marketing, intent tracking, etc has uses in national security. Same thing that might let meta know you might be interested in batman pajamas can be used to sort out if you are being radicalized to action by some group. Interesting example is fractalrabbit.

Group of people who both have the theoretical training and practical experience is probably pretty small so private/public crossover isn't unreasonable.

I’m going with:

> The government is trying to control your mind through the internet

I think it's pretty clear what the post is saying. It doesn't need to be clarified, it needs to be supported, though the nature of the claim is such that it would be tough to provide direct evidence.