The oft-mentioned so-called 'Flat Earth Society' consisted pretty much of one man (in England I think from memory, but can't be bothered looking it up).

The man in the UK was probably the founder of the Universal Zetetic Society (link) Samuel Shenton. Until his death in 2001, Charles K Johnson lead the group from Lancaster, CA. There are some members worldwide. The BBC had this to say about the flat-earthers recently (link). There's an online presence via a forum (link). Enjoy. ("Now, where did I bookmark that Luddite group's URL?") I've found that you can find people who believe in almost anything, but then I've lived in California most of my life, and it's a well-known kook-magnet. Must be the clement weather.

Ceci n'est pas un seing.