title: How to authenticate instagram and like and comment on a pic?
body: <p>I am making an instagram app in which i will show all the pics of a user ( by entering the name of the user ), so the user without authenticating can see the timeline of that user.</p>
  
  <p>But i want the user to be able to like and comment the pic, for that authentication is required, in facebook they provide sdk but in instagram i could'nt find any sdk and third party lib.</p>
  
  <p>Can anyone help me in authentication, liking and commenting in instaGram??</p>