Happy foursquare day! (four squared = 4/16, get it?) Here's a toast to all of you for making foursquare so amazing and to the 150+ #4sqDay parties going on around the world!
On 4/16/2010 include "#4sqday" or "happy foursquare day" in a shout message.
Expired: Only available on 4/16/2010.
Update: The name of the badge was changed to the Hashtag for the day "4sqDay 2010". Also the text was changed from "50+ 4sq Day parties" to "150+ #4sqDay parties". This change was made to the text of the badge if you got it early in the day or later.