Ok gotcha; so order is an alternated list of the three sources. This is a good default but you might be able to do something fun here - perhaps ranking stories

Ok gotcha; so order is an alternated list of the three sources. This is a good default but you might be able to do something fun here - perhaps ranking stories based on their vote count stdev from the mean score might give an interesting list. serializer is just a web app and lists stories in a sequential feed - while it has HN, reddit & slashdot on there it's kind of a different concept. It's more of a 'reader'/feed that happens to combine various sources.