Wiki Comparing Discussion Forums and Email

Wiki for comparing discussion forums with email communications
Benefits and weaknesses, or just characteristics.

Add columns for chat and wiki ?

Discussion Forums
Email Communications
Chat
Wikis
public (to participants ... or even to global audience)
confidential (?)


requires login and a few extra clicks
quick


complete view of the discussion


free for subscription or de-subscription
-(felt as spam if not interesting)


provides neat evolution record



Some where between chat and email in terms of formality
More formal at times, can be like writing memos
Very informal, like making side comments or small talk

Well considered, even calculated messages

Spontaneous, reactive, superficial messages