Step 1: How it works
An Arduino connects directly (no computer required!) to any wireless network via the WiFly module, repeatedly searches Twitter for tweets with emotional content (aka sentiment extraction or tapping into the moodosphere), collates the tweets for each emotion, analyzes the data, and fades the color of an LED to reflect the current World Mood:
Red for Anger
Yellow for Happy
Pink for Love
White for Fear
Green for Envy
Orange for Surprise
Blue for Sadness