A “twibbon” is a way to promote your cause by adding a banner to the lower right hand corner of your twitter pic.
Here's one I created for LGBT Equality:
How cool is this?
Twibbon.com was created by stormideas to provide way to promote causes on Twitter.
Twitter has become a tool of political discourse, and a visual makes a strong statement. In just 2 minutes you too can Start Something!
Indonesia United already has over 10,000 users with twibbons to protest terrorism in Jakarta. http://twibbon.com/join/IndonesiaUnite
More of that story here: http://twibbon.com/twibute/IndonesiaUnite
If you like Twibbon and want to ask questions about it, drop them a line at firstname.lastname@example.org