This page in a nutshell: Editors younger than 13 should not put personally identifying information on any page. This includes real name, e-mail, home address, school and telephone number. Information of this type should be removed, and the editor who is under 13 should be told not to re-enter it on penalty of blocking. Editors should not knowingly attempt to elicit such information from those identifying as under 13.
Wikipedia is a free and open encyclopedia that can be accessed, read, and edited by any user who wishes to do so, and without discrimination, based on one's age, gender, sexuality, location, ethnicity, country of origin, religious, political and ideological beliefs or practices, education level, or income level. Because of Wikipedia's principle of free and open access by anyone, including children, volunteer editors and trusted members of the community try to take measures and actions necessary to assure that all of Wikipedia's young readers and editors are provided a welcome and safe environment on Wikipedia and kept safe from online harassment or stalking, inappropriate or uncomfortable interactions with adults, and other forms of online harm. Reasonable measures which prevent and stop potential problems associated with the use and editing of Wikipedia by children are appropriate and usually necessary. This essay provides a general summary of these appropriate measures and actions taken, how to handle and report instances where a child's personal information or online safety is at risk, and links to Wikipedia pages and resources for parents and editors regarding child online safety and privacy.