Steve Rubel’s thoughtful post worries that both Facebook and Google are making their products too complicated for mainstream users to fully exploit their features. There’s always a UI battle between easy to learn and easy to use. Adopting interface metaphors for tasks consumers already understand usually works better than pop-up demonstrations and explanations. And algorithms can help a lot. Facebook smartly pre-populated some obvious friends’ Lists (as I suggested when Google introduced Circles). And blending algorithms with user controls is the way to build a better feed. Here’s our summary of what Facebook was doing at its f8 developer event, and you can read my analysis in this week’s Update.