Ratings not showing in SharePoint 2010

You can configure ratings on list items that aggregates user selections, however when you select a rating it doesn’t instantly appear.
This is because there are two timer jobs that are set to run hourly that calculates this information:
User Profile Service Application – Social Data Maintenance Job
User Profile Service Application – Social Rating Synchronisation Job

If you want ratings to update more often, you should change the schedule accordingly. you can of course just click “Run Now” to get them updated immediately.

 

Fuente: http://gavinmckay.wordpress.com/