Half of online adults ages 50-64 and one in four wired seniors now count themselves among the Facebooking and Linked In masses.
You can take Pile's "Facebook Compulsion Inventory" to find out.
It can also be accessed on the web from a computer, but users can only upload and share photos or videos from their devices.
Before you can start using the app, Instagram will ask you to create a free account.
Instagram is a social networking app made for sharing photos and videos from a smartphone.
Similar to Facebook or Twitter, everyone who creates an Instagram account has a profile and a news feed.