Guilds are organized groups players who join together for a variety of reasons. Guilds are a staple in most MMO's,And have been recently implemented.
Guild Ranks
Master-owner: can promote/demote anyone and kick anyone
Officer-trusted member: can kick anyone (a officer needs trust before promoted)
Recruiter-inviter: can only invite people to fill the guild up
Member-guest: can't do anything
(type /g (message) to guild chat)
List of some guilds
Pocket Community
Weliketololz
Tron
Wolf Clan
Chaos and Order
Order and Chaos
Farmers
Please add more if you please