I reckon the White Paper got some stuff wrong, too.

"...multiple popular tags which include the best of the newest articles in each."

Whose gonna choose the 'best'? I reckon trending will work just fine if we eliminate profiteering, which isn't that hard to do. The Huey Long algorithm will fix it quick. Prolly plenty of other ways to do so too, and if better minds than mine set about figuring them, better proposals than mine will come up.