+<strong>help</strong>:
+> -c help is a class for asking (and answering) questions on virtually
+> any topic imaginable. Be sure to use an instance (such as
+> “linux”, “barnowl”, “campus”, or
+> so on) when asking questions, since it's a fairly high-traffic
+> class.
+
+<strong>sipb</strong>:
+> -c sipb is where most SIPB members hang out. It's a place for
+> technical discussion, questions, support, and organizing SIPB events
+> or projects. You should also always use an instance when sending to
+> -c sipb.
+
+<strong>Personal Classes</strong>:
+> By convention, nearly every Zephyr user has a "personal" class that
+> is the same as their username. How this class is used varies from
+> person to person, but it's often a sort of mini-blog, a place to
+> report what one is working on or up to, or ask friends questions, or
+> just rant about something.
+
+<strong>hello</strong>:
+> -c hello is for introducing yourself to the Zephyrsphere!
+> Send a zephyr to `-c hello -i YOUR_USERNAME` to let people
+> know you're a Zephyr user! This is a way to find out who else you know
+> uses Zephyr so you can subscribe to their class, and to get to know
+> new people through Zephyr. Also, feel free to invite others to
+> subscribe to your class!
+
+<strong>unclasses</strong>:
+> Most classes have an unclass, formed by prefixing "un" to the name. For
+> example, -c help has the unclass -c unhelp. The unclass is generally used for
+> snarky or unproductive replies; the prototypical example that first inspired
+> their creation was telling somebody with computer issues to run
+> `sudo rm -rf /`. Rarely, un- prefixes are stacked for even snarkier
+> discussion, on -c ununhelp and so on.
+
+<strong>.d classes</strong>:
+> Classes like -c help.d are sometimes used for discussions that deviate from
+> the conversation on the main class. .d instances are more common, though;
+> see below.