{
  "id": 3715,
  "title": "How to understand the User Friend relationship",
  "url": "/competitions/event-recommendation-engine-challenge/discussion/3715",
  "author_name": "",
  "post_date": "2013-01-29T06:01:35.670Z",
  "votes": null,
  "comment_count": 2,
  "views": 1453,
  "content": "<p>In&nbsp;user_friends file, it list userid &#43; friendids pair.</p>\r\n<p>I want to know, if B is in A's friend id list, then A should be in B's friend id list or not?</p>\r\n<p>It means,&nbsp;is the user_friend graph an “<span>undirected graph</span>” or an &quot;directed graph&quot; ?</p>",
  "messages": [
    {
      "id": "19783",
      "postDate": "01/29/2013 06:01:35",
      "content": "<p>In&nbsp;user_friends file, it list userid &#43; friendids pair.</p>\r\n<p>I want to know, if B is in A's friend id list, then A should be in B's friend id list or not?</p>\r\n<p>It means,&nbsp;is the user_friend graph an “<span>undirected graph</span>” or an &quot;directed graph&quot; ?</p>",
      "rawMarkdown": "",
      "votes": null
    },
    {
      "id": "19784",
      "postDate": "01/29/2013 06:54:38",
      "content": "<p>I looked up on this in the context of finding friends of friends. I could not find friends_id in the user_id column, so I guess the friendship graph of the friends is missing. The question whether user_friend graph is directed or not cannot be answered from\r\n given data. Maybe the organisors can say something about this.</p>",
      "rawMarkdown": "",
      "votes": null
    },
    {
      "id": "19796",
      "postDate": "01/29/2013 18:30:24",
      "content": "<p>It's a directed graph. Not all friend relationships are stored in both directions, but relationship symmetry is implied.</p>",
      "rawMarkdown": "",
      "votes": null
    }
  ],
  "comments": [
    {
      "id": 19784,
      "author_name": "imam123",
      "author_url": "",
      "post_date": "01/29/2013 06:54:38",
      "content": "<p>I looked up on this in the context of finding friends of friends. I could not find friends_id in the user_id column, so I guess the friendship graph of the friends is missing. The question whether user_friend graph is directed or not cannot be answered from\r\n given data. Maybe the organisors can say something about this.</p>",
      "votes": null,
      "replies": []
    },
    {
      "id": 19796,
      "author_name": "events4you",
      "author_url": "",
      "post_date": "01/29/2013 18:30:24",
      "content": "<p>It's a directed graph. Not all friend relationships are stored in both directions, but relationship symmetry is implied.</p>",
      "votes": null,
      "replies": []
    }
  ],
  "raw_markdown_by_id": {
    "19783": "",
    "19784": "",
    "19796": ""
  },
  "source": "meta"
}