(n) A form of copypasta seen on Facebook. Acronym stands for Facebook Transmitted Disease. For most of them, their only purpose is to travel from wall to wall, replicating itself. Occasionally they will have a legitimate reason for existence, such as Breast Cancer Awareness week, and afterwards will continue to circulate long after the event they were promoting passed up.
Ugh, Jill is constantly getting infected with FTD's. Why can't she stop?