An excerpt from http://www.sitepoint.com/better-user-interfaces-copy/, by Diana MacDonald
There exists a debate within the User Experience community about whether a user interface should say ‘Your account‘ or ‘My account‘ to refer to the user’s account. Should the call to action be ‘Create your account‘ or Create my account?
Pinterest and Trello are both social web apps that use “boards”, yet see how they differ!
Pinterest: YOUR Board button
Trello: MY Boards button
When it comes time to delete your account, however, they both switch terms:
Pinterest: Deactivate MY account
Trello: Permanently delete YOUR entire account forever?