When a Wiki article is authored, it starts at zero page views. As the page is viewed and reaches certain milestones, the author is awarded MSDN/TechNet recognition points and a milestone announcement is listed in the Activity page of their profile.
Below are some of the observed milestone announcements.
Note: The profile announcements only show up on the original Wiki authors profile page when the view milestone is reached. Editors of the article are not notified of the page view milestones.
More details on the Milestone Announcements (or Activity Messages) are available at
TechNet Wiki: How to Earn Recognition Points and Achievement Medals.