text: systems of the 1980s and 1990s especially, where customers gave a performance on (typically VHS) video, which was viewable by other customers, usually in private, in the same facility. Some services would record and play back videos for men and women on alternate days to minimize the chance that customers would meet each other on the street.
  Phone dating systems of about the same vintage, where customers call a common voice mail or phone-chat server at a common local phone number, and are connected with other (reputed) singles, and typically charged by the minute as if it were a long-distance call (often a very expensive one). A key problem of such systems was that they were hard to differentiate from a phone porn service or "phone sex" where female operators are paid to arouse male customers and have no intention of ever dating them.
  Online dating systems use websites or mobile phone apps to connect possible romantic or sexual partners.
  Computers as matchmakers
  Computer dating systems of the later 20th century, especially popular in the 1960s and 1970s, before the rise of sophisticated phone and computer systems, gave customers forms that they filled out with important tolerances and preferences, which were "matched by computer" to determine "compatibility" of the two customers. The history of dating systems is closely tied to the history of technologies that support them, although a statistics-based dating service that used data from forms filled out by customers opened in Newark, New Jersey in 1941.