From EVE History
The '23' are a group of legendary forum warriors who are said to have been the greatest forum posters in the history of EVE Online. Membership of the 23 is often determined by the influence, rather than the pure number, of an individual's posts. Thus a member of the 23 may be able to make history with a single post on the forum, though being prolific certainly helps in improving the reputation of a forum user. The full list of members is unknown, and there is doubt as to whether there were actually 23 'members' as the name suggests. What follows here is mostly speculation.
One thing that is almost certain about the 23 is that their current lord is none other than Dark Shikari, one of Eve's most famous forum users. He is reputed to be something of an expert in science and technology, often holding a strong opinion on matters of contemporary science. He can be found in many threads across the Eve Online forums extolling the virtues of his opinion.
The '23' List
Other members of the 23, past and present, are believed to have been: