SharePoint 2010 offers a new way of looking at the world, the Activity Feed (a.k.a the “My Newsfeed” section of your My Site). There seems to be plenty of confusion on what exactly is tracked in your Activity Feed, who sees what, and when it shows up on the site.
First things first…the Activity Feed works on a timer job, one of many jobs that make up the User Profile Service Application (Service Applications have replaced the SSP from MOSS 2007). This job can be configured to run on any schedule you choose. SharePoint defaults to hourly, but this can changed easily enough. Every time the job runs, a crawler goes out, scans the farm, aggregates recently submitted activities and shoves them into their own database. Once inside the Activity Feed database, the activity is now available on your My Newsfeed (and via the Activity Feed APIs via the SharePoint Object Model…more on that in a future post).