How to know what apps use data?

Ok so i got the Iphone 5 and have 2 gigabites. And i wanted to know if these apps use data.
-instagram?
-ifunny?
-weather?
-google translate?
-100 floors?
-shazam?
-pandora?
- a countdown?
Please answer to any of these that you know that use data. Also if you know of any other obvious app that can use data.

They all do with initial download. 100 floors is just a game so no. Not sure what a "countdown" is, but other than that they all do.