code: function shouldRequestRecs( state, streamKey, recsStreamKey ) {
  	if ( ! recsStreamKey ) {
  		return false;
  	}
  
  	const totalSubs = getReaderFollows( state ).length;
  	const items = getReaderStream( state, streamKey ).items;
  	const recsStream = getReaderStream( state, recsStreamKey );
  	const recs = recsStream.items;
  
  	if ( recsStream.lastPage || recsStream.isRequesting ) {
  		return false;
  	}
  
  	if ( recs.length === 0 ) {
  		return true;
  	}
  
  	return recs.length < items.length * ( RECS_PER_BLOCK / getDistanceBetweenRecs( totalSubs ) );
  }
docs: /*
  shouldRequestRecs is used for calculating whether or not we need more recommendations
  to display in-stream recs for a stream.