Black Mage: Effort poasters. Whether through groundbreaking Scholarship or schticks, these poasters are the nukers of xo. They're responsible for all most bumped poasts of all time, at the expense of the consistent output of the warriors because of their limited mana pool and long cooldowns. They're glass cannons so they're squishy and need support to be effective, without any support abilities of their own.

White Mage: Kindness poasters. The dedicated support poaster. These poasters specialize in bumping and kindness poasting. A beloved and necessary part of the bort, these poasters trade making poasts directly in exchange for powerful support spells. Although their poasting spells are limited, the ones they do have are quite powerful, and can deal effect burst poasting in a pinch.

Blue Mage: Pumos. The poasters have no real poast ability of their own, preferring to borrow the skills of other poasters. While they cannot excel at anything like the specialists classes, their strength comes from their versatility and the ability to becomes whatever the bort needs at the time.

Bard: Lunchpail poasters. This off-support class is proficient at everything, and can be a serviceable frontline poaster while also packing powerful support spells. They dabble in effort, politics, memes, and bumping. Carefree and nimble, this poaster can't directly tank the damage of the warrior but can be a great dodgetanks, mitigating feud damage evading it completely.

Berserker: Schizo Lib Spammers. Similar to the warrior, this poaster contributes specializes in consistently generating poasts. Rapidly poasts low-impact threads, lacking the burst of warriors but being able to overwhelm the front page with (1) threads. Although with a high crit modifier, when a thread does hit it can hit big, but the randomness means it's difficult to use this tactically. Unique rage mechanic increases poast frequency as they take damage, putting them at risk of being knocked and going dormant.

(http://www.autoadmit.com/thread.php?thread_id=5839112&forum_id=2Firm#49700796)