Arduino + twitter?

New to the forum, so hello!

I have a question: I would like to control some electronic devices in my house using twitter.

I'm using an arduino uno + ethernet shield, and using a relay to switch the device on or off.

Basically what I want to do is send a tweet: "Coffee on", have the arduino read the tweet, and turn on the device.

I looked at a few tutorials, and tried some stuff out, but so far I have no success.

Is this still possible to achieve? Thank you for reading!