{
 extractors: [
  {
    name:MatchingTermCount
  },
  {
    name: QueryLength
  },
  {
    name:QueryLength
  },
  {
    name: TwitterHashtagCount
  },
  {
    name: IsTweetReply
  },
  {
    name: TwitterLinkCount
  },
  {
    name : TwitterFollowerCount
  },
  {
    name: TwitterFriendCount
  }
 ]
}