The article shows how to use a Raspberry Pi with an RGB LCD to monitor tweets. Tweets containing specific keywords are displayed in defined colours. It explains how to create a Twitter application to use the stream API to push data to a multi-threaded Python program.
A second follow-up article to "How to Build a Tweet Controlled RGB LCD" is planned. This will add a web interface to the program so you can change what you're following and the colour mappings.