Matt has connected several items to an IoBridge module that he controls via sending Tweets to his Twitter account. An ioBridge module makes it easy to interface real world devices with the web. The ioBridge IO-204 Monitor & Control Module connects to your home network and lets you monitor and control electrical signals. The module can do things as simple as monitor temperature or as advanced as control R/C servos.
Commands to the module are sent by placing a keyword in a @reply message to the account. Keywords include light, bright, temp, etc. The module can also respond back to simple questions such as “What is the temperature?”