title: How to retrieve all public images (posts) from a facebook search by hashtag in rails?
body: <p>I have to create an application, which retrieves images by a given facebook hashtag, and stores data in database (with the post, hashtags, and the image)</p>
  
  <p>Is this possible? I have no idea where to start. Do I need omniauth for this, or if it's public, it works without it.</p>
  
  <p>The processing should run in a rake task, not in a browser.</p>