Bitcoin did not spread because of social media, but rather because it provided a solution to an economic problem, whose features began to appear in the year 2008 accompanying the mortgage crisis, urging that Satoshi did not pay much to promote this technology, unlike what is happening now, for example, TikTok paid more than a billion dollars in one year To promote and advertise, something that has not happened in the history of Bitcoin.
If your service is good and solves a problem, it will be lucky to spread for free.
Social media was not popular back then. People used to use email and forums for discussion. Nowadays, everyone uses social media and can use Bitcoin easily. But old timers had to understand many things to run Bitcoin Node to use Bitcoin. I believe they adopted Bitcoin because they understand the importance of privacy. Now most newcomers use Bitcoin to make money only.