Instagram is an online photo-sharing, video-sharing and social networking service that enables its users to take pictures and videos, apply digital filters to them, and share them on a variety of social networking services, such as Facebook, Twitter, Tumblr and Flickr.If you post your content in the right way, #Igers will appreciate you being there.Instagram has introduced new and valuable features for businesses, aimed in particular at small- to medium-sized companies that don't yet advertise on the social media platform.