Users were saddened and angered today by a marathon outage at Foursquare.

The dominant player in the geolocation/social space has been out for nine hours so far; while staff say engineers are peering at “the light at the end of a tunnel,” we have no exact word on why the service is down or precisely when it will come back online.

Earlier today, a staffer posted on the company’s official Twitter account, “The servers are overloaded but we’re working on it! We will be back up ASAP.” This message was followed by the hashtag #caseofthemondays, a reference to a quotation from Office Space. A variant of this hashtag popped up in an update six hours later, indicating the engineering team had made little headway in repairing the server issues.

Then, about one hour ago, @Foursquare tweeted that the company’s entire engineering team had been called to work on the servers, vowing #NoSleepTillUptime.

Another Fousquare staffer wrote in an email, “Our engineers are working nonstop to get the site back up and running as quickly as possible. We’ll be putting up a detailed post mortem once we’ve resolved the issue tomorrow.”

UPDATE: Foursquare is back up again! A hearty congratulations to the engineers for restoring service shortly before midnight at Foursquare HQ in New York City. We look forward to reading the post mortem tomorrow.

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