The live data feed for Second Life concurrency is off the air. It went dark on the afternoon of Thursday, 30 April, and hasn't been updated since.
Normally, I'd think of this as just another glitch in the statistical feeds. Heaven knows, there have been plenty of those -- having some missing data is not uncommon.
The timing got me thinking, though.
You see, Linden Lab purged a whole bunch of inactive, never-logged-on accounts (somewhere around the 800,000) mark. And just prior to doing so, the feed for the total number of accounts went dark - and has remained that way ever since.
30 April, coincidentally marked the day that the Lab was going to start taking action against traffic bots. Everyone, of course, was expecting to see concurrency take a bit of a hit, though it wasn't clear how much of a hit. Hard to tell, though, because the concurrency stats went dark that very day.
I'd love to think this was a coincidence, but the available history makes that an unreasonable conclusion.