The Twitpic Terms of Service currently reads:

By uploading your photos to Twitpic you give Twitpic permission to use or distribute your photos on Twitpic.com or affiliated sites All images uploaded are copyright their respective owners

I sent the following to the generic email address publicly available, even though Twitpic a service I only use as a content consumer, not as a content producer:

From: Eric Garrido (eric@ericgar.com)
To: support@twitpic.com
Cc: 
Bcc: 
Subject: Please support Creative Commons
Reply-To: 

Twitpic,

Please consider supporting Creative Commons by allowing new users to 
specify to license their content by default under one of the available 
licenses, and specifying per-work that a CC license may or may
not apply.

Creative Commons makes for a more useful internet and should be 
actively encouraged where there is a democratized content creation 
arena.

Please consider making the internet even better by allowing your 
users the choice of Creative Commons.

Thanks,
Eric Garrido

Creative Commons is basically a legal democratizer for the internet. It allows you to share the content you’ve published publicly, since all content is immediately covered under a strict copyright law unless otherwise specified.

Please think about publishing your own work (on Flickr, your blog, or elsewhere) under one of the Creative Commons licenses.