They use Google tag manager in their signup page. Translation, Google will know your user name, tie it to your real identity, and will track everything you say.
They'll track everything you share, like, comment, etc. You're helping them build a profile on you. Unless you're completely insulated from all advertising, they will find ways to "nudge" you into making purchases and forming opinions.
Nudging is a slow process that happens on the subconscious level: https://www.convertize.com/what-is-nudge-marketing/
Nudge marketing refers to deliberately manipulating how choices are presented to consumers. Its goal is to influence what consumers choose, either to steer them toward options that the marketer believes are good for them or simply to stimulate purchases and increase sales
1 more peice of the puzzle. An additional purpose of the invasive phsych marketing, on top of all the obvious deep state benifits to having nsa style surveillance, is to construct a more confrontational relationship between consumer and producer. The government has already ruined the (current) "free" market system with layer after layer of socialism, now they have set up a situation where every business from mega Corp to small business is funding mass survailence, and they are not hiding it. waking up to this fact alone without the bigger picture further alienates normies from the idea of capitalism.