Not only do the social graph calls now suddenly, without any prior warning of announcement, return only 5,000 ids, it is messed up even when you do the paging as per the API documentation.
Case in point. @socialoomph has 16,598 followers. If you page through the follower ids with &page, you get only 12,017 entries. This is highly frustrating, and it has now completely screwed up my follower processing. It does not help that Twitter has rolled out something into production without any kind of testing, right before a weekend. Dewald