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The creators of S. have created some promotional videos and social media accounts to publicize the book, and there are also several websites and blogs that try to decipher the cryptic clue within the text to figure out what is coming next.
Before the book came out, a countdown site was created to garner anticipation for S.'s release.
An official online radio station, known as Radio Straka, has different stations to tune in to which play both music and talk radio.
There is also a promotional trailer for the book that is titled "S Trailer 1".
WhoIsStraka takes clues from the book as well as real world clues and speculates on what the next step will be for S.
SFiles22 has information on the codes found throughout the book, marginalia, inserts, etc.