Disable SharePoint 2010 "I like it" "Tags & Notes" Social Feature

You can enable/disable social tagging feature for specific users or groups by removing them from the Use Social Features permission, which is part of the User Profile service | Manage User Permissions.

If you want the the I Like It and Tags & Notes UI controls to disappear, then you need to disable the SocialRibbonControl (Social Tags and Note Board Ribbon Controls)
feature. You can enable/disable this feature by going to CA->System Settings->Manage farm features under Farm Management heading. Please note the scope of the feature is at the farm level.

For detail, see http://technet. microsoft. com/en-us/ library/ee721064 .aspx