code: func (r *run) getTopLevelNode(path string) (*importer.Object, error) {
  	acctNode := r.AccountNode()
  
  	root := r.RootNode()
  	rootTitle := fmt.Sprintf("%s's Twitter Data", acctNode.Attr(importer.AcctAttrUserName))
  	if err := root.SetAttr(nodeattr.Title, rootTitle); err != nil {
  		return nil, err
  	}
  
  	obj, err := root.ChildPathObject(path)
  	if err != nil {
  		return nil, err
  	}
  	var title string
  	switch path {
  	case "tweets":
  		title = fmt.Sprintf("%s's Tweets", acctNode.Attr(importer.AcctAttrUserName))
  	case "likes":
  		title = fmt.Sprintf("%s's Likes", acctNode.Attr(importer.AcctAttrUserName))
  	}
  	return obj, obj.SetAttr(nodeattr.Title, title)
  }
docs: // path may be of: "tweets". (TODO: "lists", "direct_messages", etc.)