Foursquare allows you to check-in from mobile devices via it's app for different devices. Is there a way to check-in from your PC?
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Nope, you can't check in without a mobile device. All you can do is change your current location. Just login to the Foursquare site and change your current location.
It was possible until a couple of months ago. I just tried to log in by using foursquare.com/mobile/login page, however it does not work anymore. Link redirects you to foursquare.com/download
You can check-in from your PC as well using http://m.foursquare.com I don't know if it checks the IP address to see if the location is within reach or not.
Also, TweetDeck has provided support for Foursquare and the desktop version of the software allows you to update your location from desktop.