The CEO of Instagram sheds light on why its ads can be so spot on -- and it's not from spying, because it doesn't need to.

So, what is Instagram? Welcome to your go-to guide to the fast-growing, ever-changing social media platform that is Instagram.

Young people are using Instagram for everything except the app’s original function. By Callie Holtermann How badly does the photo-sharing app Instagram covet young users? On Thursday, it introduced ...