The Next Web writes, As someone who saw Delicious’ stacks feature as its USP, I’m somewhat surprised at this. Delicious has decided to make changes to its feature set, the most significant being the removal of “stacks”, a feature which let its users collaboratively create collections of links. Delicious will instead now revert back to its basic and original tagging feature, common to most social bookmarking sites on the web. The reason isn’t clear but a note in the announcement email suggests another product by its partent company AVOS, will give us a clue. “…given the...