The “threaded conversation” structure (where the header of a first post defines the topic of a series of answers thus constituting a thread) is a typical and ubiquitous structure of discourse within lists and fora of the Internet. It is pivotal to the structure and topicality of debates within mailing lists as an arena, or public sphere in Habermas wording. The flame wars (as the liveliest episodes) give valuable and unique information to historians to comprehend what is at stake in the communities gathered around lists.[5]