Q&A for network engineers
select TOP 5000 u1.Id, u2.Id, u1.Reputation, u2.Reputation, Count(1) FROM PostTags, Posts p1, Posts p2, Users u1, Users u2 WHERE PostTags.TagId = 1386 AND PostTags.PostId = p1.Id AND p1.CreationDate >= '2012-01-01' AND p2.ParentId = p1.Id AND p1.OwnerUserId IS NOT NULL AND p2.OwnerUserId IS NOT NULL AND p1.OwnerUserId <> p2.OwnerUserId AND p1.PostTypeId <= 2 AND p2.PostTypeId <= 2 AND p1.OwnerUserId = u1.Id AND p2.OwnerUserId = u2.Id GROUP BY u1.Id, u2.Id, u1.Reputation, u2.Reputation ORDER BY Count(1) DESC