By Melony Roy

PHILADELPHIA (CBS) – It’s a celebration of Foursquare, today. The tech-savvy in Philly are participating, one check-in at a time.

Foursquare Day is held every year on April 16th (April being the fourth month, 16 being four squared).

For those unfamiliar with Foursquare, Caroline Bean, director of social media at Greater Philadelphia Tourism Marketing Corporation, explains:

“Foursquare is a mobile app where people can use their phone to check in at a building or venue, and Foursquare would share that.”

So, what is Philadelphia doing in honor of Foursquare Day?

“We will be creating a Foursquare list of 16 places that have the word ‘square’ in their name. We will be leaving a tip in one of those venues and, at 4:16 p.m., we will be at one of those locations giving away 16 gift certificates.”

Listen to Meloney Roy’s full interview with Caroline Bean in this CBS Philly podcast…

Download the podcast (runs 4:14)

Then, later in the evening, a Foursquare tournament was being held at the Marian Anderson Recreation Center in South Philadelphia.  It’s “Hunger Games” style, and begins at 7:30pm.  You can attend, or watch it on Livestream.