Instructable: http://www.instructables.com/id/Raspberry-Pi-Twitter-Candy-Bot/
Step 1: RasPi setup: http://www.raspberrypi.org/help/quick-start-guide/
Step 2: NodeJS setup: http://weworkweplay.com/play/raspberry-pi-nodejs/
Step 3: WiFi setup: http://raspberrypihq.com/how-to-add-wifi-to-the-ra...
Step 4: Fork/ Download code from GitHub: https://github.com/davidrs/candy-pi