is a service that lets people overlay small images on their Facebook photos or Twitter avatars to show their affection, hatred, or support for something. So far, the application claims a range of over 40,000 causes.

This year, Twibbon can add to the cause list. The gaming charity marathon centers on several gamers playing the from the canned Penn & Teller video game for as long as they physically can. The more people donate, the longer they play.

The marathon kicks off in four days. Twibbon support spiked sharply yesterday with more people steadily adding the Desert Bus logo to their Facebook and Twitter accounts today. Get in on it .

This article originally appeared on GamePro.com as