LinkedIn down

Checking LinkedIn in the early afternoon reveals:

LinkedIn Will Be Back Soon

We are busy upgrading LinkedIn with technology and features to add even more ways for you to leverage your professional reputation and network. We will return around 9:00pm PT.

We apologize for the inconvenience and appreciate your patience. Thank you for using LinkedIn!

I am as much looking forward to new LinkedIn features as the next guy, but: At the time of this writing it is not even 4pm PT. I checked earlier and received the same message. I must admit, I am a bit surprised that LinkedIn would take the publicly-visible portion of their website offline for 5+ hours.