response: I know that it's a photo-sharing application in which users can share picture and videos to their followers or to the public.
original_response: I don't have an instagram account but my mom, my niece and a lot of family do so I know some about it.  I know that it is a mobile photo sharing app that allows the user to share pictures publicly or privately to their followers
history: Hi. You know anything about Instagram? I don't know the first thing about it. I was thinking about trying it for my business.
knowledge: Instagram is a mobile, desktop, and Internet-based photo-sharing application and service that allows users to share pictures and videos either publicly, or privately to pre-approved followers.