Foursquare Down for Over Nine Hours Monday

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If today has felt oddly calm and pleasant, there is, in fact, a reason why: Your Twitter and Facebook feeds have been free of the usual glut of “I’m @ Central Park w/ 4,023 others” and "I just became Mayor of Jamba Juice" updates. Foursquare, the dominant location-based social service, was down for about nine hours Monday, with the service returning at about 11:40 p.m. While there has been no explanation for the outage yet, a “detailed post-mortem” has been promised for Tuesday. If they haven't already, someone should look into the Twitter bird’s whereabouts Monday afternoon. [Mashable]