Wikipedia:Village pump (proposals)/Dealing with vandalism
How about this idea:
1) Have a bunch of 'super users' generally accepted as 'fair'. To become a 'super-user', you must have posted a certain number of things, and had your content been found worthy by an administrator.
2) Have super user posts look different (different color for example) and only be editable/removable by other super-users.
3) Allow normal people to flag 'super user' content as untrue. Super users must examine at least one unexamined but flagged content from another user before they can add any other content.
4) Super-users that have their content changed by other super-users too often will acquire the notice of an administrator that may choose to revoke super-user status.
This method A) Continues to let anyone post anything they want. B) Lets people know what facts are more reliable and what is less reliable C) After start up work (identifing the first super-users), does not entail significant additional work for users or administrators. D) Retains the general idea and the 'feel' of wikipedia.