Virtually every MOO tries to impose a minimal set of manners to its users. First of all respect of the theme is important, not just in research and education MOOs as the following quote from BayMOO shows:
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>go theme
You step through the opening into the module named Theme of BayMOO.
Intro to BayMOO [Theme of BayMOO: Theme : Overview]
There are two major themes that make BayMOO unique among the all-text virtual
realities on the NET:
1) The Humanities of the San Francisco Bay Area and
2) The Meanings of Water.
These are available to all who want to explore their uses, and the
janitors of BayMOO urge you to use them. But those who feel called to
other frontiers are also welcome to help build BayMOO.
BayMOO has a one-word code of ethics: RESPECT
As long as characters respect each others' feelings, BayMOO is a
wide-open textual terrain for the imagination.
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The theme (and encouragement to respect it) is often shown in the Welcome Screen (see section 3.2.1). A lot of MOOs also provide a 'help manners' command or equivalent.
By looking at several MOOs (see: 9.3.1 and 9.3.2) one can kind find several major topics:
Basically manners look at lot like manners expected in a real society. As in the real world different manners apply for different contexts.