edinburgher - 6:44 am on May 12, 2012 (gmt 0)
It might just be a server under maintenance.....
This doesn't "feel" like a server problem. I suspect they have a massive bank of cheap servers, losing one or two wouldn't cause such a massive snafu.
They probably also have their own in-house written messaging middleware for passing click details around. I wonder if that's not up to the job and is getting swamped, possibly even dropping messages (ie clicks).
(PS: new low for me on Friday)