CheckUser is an interface for users with the checkuser permission. An editor with CheckUser status on a wiki can in particular examine evidence to adjudge the likelyhood that a user is or isn't sockpuppet of another user on that particular wiki. (The check is specific, and does not cover activity on other wikis). By using it, users are able to:
- Determine from which IPs a user has edited the Wikimedia wiki
- Determine the edits on the Wikimedia wiki of a specific IP (even when logged in)
This information is only stored for a short period, so edits made prior to that will not be shown via CheckUser. A log is kept of who has made which queries with the tool. This log is available to those with the checkuser permission:
5 sep 2006 17:29 UserX got IPs for UserY 5 sep 2006 17:29 UserX got edits for 127.0.0.1
See Help:CheckUser for the user manual. Note that this tool only helps provide information to base a considered judgement on, it cannot give definitive answers and in particular should not be used to try to "prove innocence".
Use of the tool
The tool is to be used to fight vandalism, to check for sockpuppet abuse, and to limit disruption of the project. It must be used only to prevent damage to any of Wikimedia projects.
The tool should not be used for political control; to apply pressure on editors; or as a threat against another editor in a content dispute. There must be a valid reason to check a user. Note that alternative accounts are not forbidden, so long as they are not used in violation of the policies (for example, to double-vote or to increase the apparent support for any given position).
Some wikis allow an editor's IPs to be checked upon his or her request if, for example, there is a need to provide evidence of innocence against a sockpuppet allegation; note, however, that requesting a checkuser in these circumstances is sometimes part of the attempt to disrupt.
- Policy on release of data derived from page logs
- It is the policy of Wikimedia that personally identifiable data collected in the server logs, or through records in the database via the CheckUser feature, may be released by the system administrators or users with CheckUser access, in the following situations:
- In response to a valid subpoena or other compulsory request from law enforcement
- With permission of the affected user
- To the chair of Wikimedia Foundation, his legal counsel, or his designee, when necessary for investigation of abuse complaints.
- Where the information pertains to page views generated by a spider or bot and its dissemination is necessary to illustrate or resolve technical issues.
- Where the user has been vandalising articles or persistently behaving in a disruptive way, data may be released to assist in the targeting of IP blocks, or to assist in the formulation of a complaint to relevant Internet Service Providers
- Where it is reasonably necessary to protect the rights, property or safety of the Wikimedia Foundation, its users or the public.
Even if the user is committing abuse, it's best not to reveal personal information if possible.
- Generally, do not reveal IPs. Only give information such as same network/not same network or similar. If detailed information is provided, make sure the person you are giving it to is a trusted person and will not reveal it himself.
- If the user has said they're from somewhere and the IP confirms it, it's not releasing private information to confirm it if needed.
- If they're on a large national or international ISP (e.g. AOL, NTL, BT, Telstra) where they're one of millions of users, saying so is unlikely to be personally identifiable.
- Revealing the country is generally not personally identifiable (e.g. "User:Querulous is coming in from the UK, User:Sockpuppet is coming in from Canada").
- If you're in any doubt, give no detail.
Access to checkuser
Only stewards and a very few editors are allowed to have the CheckUser status. Editors will only have CheckUser status locally.
[[meta:|Meta]] requests should be carried out by Meta CheckUsers, not stewards (as policy elsewhere).
On a wiki with a (Wikimedia-approved) Arbitration Committee (ArbCom), only editors approved by the Arbitrators may have CheckUser status. There must be at least two so that they can mutually control their activity. After agreement, simply list the candidate on Requests for permissions.
On a wiki with no Arbitration Committee, two options are possible:
- If an insufficient number of voters do not allow to vote for two checkusers on a wiki, there will be no checkuser on that wiki. Editors will have to ask a Steward to check if UserX is a sockpuppet of UserY. To do so, simply add your request to Requests for CheckUser information listing these users and explaining why you ask for such a check (with links). You also need a community consensus (like above). The Steward will answer you if these two users are from the same IP, same proxy, same network, same country, or are they completely unrelated (see discussion for what the Steward should more precisely say to the editor).
Mailing list and IRC channel
For Wikimedia checkers, there is a mailing list, checkuser-l. This is a closed list. Use this list to ask for help, ideas and second opinions if you're not sure what the data means.
Removal of access
Any user account with checkuser status that has not used the checkuser access for more than a year will see their checkuser access be removed.
In case of abusive use of the tool, the Steward or the editor with the CheckUser privilege will immediately have their access removed. This will in particular happen if checks are done routinely on editors without a serious motive to do so (links and proofs of bad behavior should be provided).
In case only one checkuser is left on a wiki, the community should elect a new checkuser (so that the number of checkusers is at least two).
Current users with access
long list commented out for now