AQL

FOR u IN users
  LET numRecommendations = LENGTH(
    FOR r IN recommendations
      FILTER r.userId == u._key
      RETURN 1
  )
  LET numRelations = LENGTH(
    FOR r IN relations
      FILTER r.from == u._key || r.to == u._key
      RETURN 1
  )
  FILTER numRecommendations > 2 && numRelations > 1
  SORT numRecommendations DESC
  LIMIT 5
  RETURN {
    user: u.name,
    recommendations: numRecommendations,
    relations: numRelations
  }