At the time of writing, Twitter is down.
Something is technically wrong.
In fact, it's been down for about an hour.
There are no details yet as to what has gone wrong.
No blood has been spilt, life carries on, but for people and businesses for whom Twitter has become an integral part of their lives it certainly feels weird not having Twitter any more.
And it's a healthy reminder that 'availability' is just as important as 'confidentiality' and 'integrity'. If a service or data you rely upon is inaccessible, that's a problem.
Me? I can get on with other work, but if Twitter was to stay down for an extended period of time that would be a nuisance.
Mostly I'm sad that Twitter doesn't have a better sense of nostalgia. I would have loved to have seen a revival of the Fail Whale which we used to see so regularly in the early days of Twitter.
Could it be a cybercriminal act that has caused Twitter to (at least temporarily) collapse? Well, it's possible I suppose.
But often times there will be a much duller technical explanation of human error, misconfiguration, and general SNAFU that can be blamed.
I guess we will know in the fullness of time.
You can follow me on Twitter at @gcluley, err... if it comes back.