Continuing the Yakread rewrite, last weekend I rewrote the part of Yakread's ranking algorithm that merges your newsletter/RSS subscriptions and your bookmarked articles into a single personalized feed. This is basically the “heart” of Yakread, the whole reason I wanted to make the app in the first place. (And it's about 200 lines of code. Funny how much additional stuff has to be layered on top just to make those 200 lines of code usable.) This part of the algorithm does three main things: it p...