Why not take a break from the fire hose of Twitter and RSS and check out our weekly roundup of essential writing from around the web about technology, culture, media, and the future? Sure, its one more thing you can feel guilty about sitting in your Instapaper queue, but its better than pulling in vain on your Twitter list again. Alex French looks at how Hollywoods year-round quest for blockbusters is changing how we find our action heroes. Chris Hemsworth was little known before “Thor,” and no one outside the industry was too familiar with Henry Cavill before “Man of Steel.” Lorenzo di Bonaventura, who produced “Transformers” and this winter’s “Jack Ryan: Shadow Recruit,” told me that studios were gambling on unproven actors for economic reasons.