Something's very wrong with the servers at mobile check-in start-up Foursquare, which had experienced problems on Monday morning and then ultimately crashed altogether and hadn't been resuscitated as of 8:00 p.m. PT.
Reached via e-mail, one of Foursquare's executives said the company was not yet willing to disclose the cause of the outage but promised that a postmortem blog post would explain the situation when it had been mitigated.
"The light at the end of the tunnel seems oh-so-close. Should have some good news soon!" a tweet from Foursquare's Twitter account read at about 7:30 p.m. PT on Monday.
Foursquare's service has gone on the fritz for notable periods of time--much as Twitter's did when it was coping with hype and fast user adoption coupled with a low employee headcount and insufficient server power--but this is potentially its longest outage to date. It's a precarious time for the Foursquare service to be down, considering it now hasand needs to be sure that its user numbers don't take a hit.
Twitter had an outage of its own Monday, coincidentally right at the timeto focus on product strategy rather than running the company.
UPDATE (8:35 p.m. PT): A Foursquare employee tells CNET that the service recently was restored and that the company is "still monitoring" its stability.