User blog comment:RePeat/Community Poll on Message Walls/@comment-7855039-20130627034219/@comment-4052371-20130627145000



This is the diff button. Whenever someone edits a mainspace page, or user page, or talk page, etc., you can click that magnifying glass button to see the exact changes they made to the page. You won't see diff buttons for contributions like Message Wall posts or blog comments, though.