Just a quick note (as a reminder to self). Here’s a list of the Custom Activity Type Names that you can refer to in your code :

• BlogUpdate
• DLMembershipChange
• SharingInterest
• SocialTaggingByColleague
• NoteboardPosts
• SocialTaggingByAnyone
• SocialRatings
• INTERNAL_ChangeMarker
• StatusMessage
• ProfilePropertyChange
• Birthday_Reminder
• Birthday_Today
• WorkplaceAnniversary_Reminder
• WorkplaceAnniversary_Today
• ColleagueAddition
• TitleChange
• ManagerChange

This is useful for code such as :

ActivityType activityType = activityManager.ActivityTypes[“Birthday_Reminder”];