Dedicated to news, reviews, and previews of the stickers found on GetGlue.com's site, this blog is the premiere resource for sticker-hunters everywhere!
I checked in 17 times and I still didn't get the sticker
Keep going at it. You may also need to un-like the topic, refresh your page, re-like the topic, refresh your page, and then check in again. Sometimes you have to pull some shenanigans to get these things to trigger properly.