Last spring we set up the Sandbar on Whrrl and Foursquare, two location-based social networs that allow you to check in, share your location and find friends. We added "specials" that allowed users to get free jukebox credits when they checked in and showed their status to the bartender.

Now, we've added a third network: Gowalla. It's similar to the others, with one big difference: the network was co-founded by an alumnus of KU. Which makes it a big deal in our opinion. And he's been to the Sandbar. Check out the picture he uploaded to our spot on Gowalla.

If you check in to the Sandbar on Gowalla, you'll get this nice friendly welcome message:

Once you check in, show this message to the bartender and they'll load five free credits on the jukebox for you. This offer is only valid before 9 p.m., any day of the week.

You can find our spot on Gowalla here.

Another reason we like Gowalla: the AP Top 25/Gowalla Check In Challenge. The contest encourages fans to check in to five designated locations on their college campuses, and at the end of the regular football season the school with the most points will earn a $10,000 donation to their general scholarship fund. You can also win random prizes like MacBook Airs and iPods, just for checking in.

KU is pretty far behind in the standings right now, but you can help! Use Gowalla to check in at the University, Allen Fieldhouse, Memorial Stadium, the Campanile or the Kansas Union and you'll earn a point. Send your check-in to Twitter or Facebook and you'll earn five more. Rock Chalk Jayhawk!