I like observing kooky Twitter as it develops to match what its users want, or claim they want. It fascinates me that something with so much activity around it hasn’t found a way to make any money yet, and yet they continue on their merry way. I just noticed this helpful obviously-human-curated development that they offer on their homepage: explanations behind trending topics.
UPDATE: Twitter is pulling the information from this user edited site What the Trend. Note: Seeing all Twitter trends clearly broken down is pretty weird, a bit like explaining a joke after everyone else laughed.