Linden Lab has, for a very long time, published quite an array of statistical data about Second Life through a regularly updated (when it worked, which it didn't always) set of statistical data feeds (mostly collected by aficionados and researchers). During mid-January, two sets of those feeds suddenly stopped working. A bug, we thought, as data-quality for the statistical has traditionally been exceptionally poor, and it was far from unprecedented.
The two casualties were total signups and the number of users logged into Second Life in the last 60 days. Interestingly, though, just after the data ceased updating, Linden Lab purged approximately 800,000 user accounts. Now, we've got no official statement from the Lab that the sudden cessation of the published data is due to a bug or due to policy -- However the sudden stop in publishing signup data, coupled with the sudden cull of nearly five percent of those signups makes for a heck of a coincidence, don't you think?