Chain letter

A chain letter is a type of letter or message that encourages the recipient to send copies of the letter to a specified number of other people. The idea is that this will create a chain of letters that spreads widely. Chain letters often promise rewards, such as money, good luck, or the avoidance of bad luck, to those who participate and pass the letter along. Chain letters can take various forms, including physical letters, emails, or messages on social media.