New Dexter stickers teased!

GetGlue has teased four new stickers related to Showtime's Dexter on their blog:  Masuka, Harry Morgan, Deb, and Miami Metro PD.  The catch to these stickers?  You have to check in to a the show on a specific night.  Which night?  They're not telling.  Set your reminders now kids, because it looks like we're all going to be spamming the check-ins for Dexter on Sundays until these stickers are found.