You can use the users/show endpoint and pass the screen_name param for what your user submits.
Here is an example no-authentication request to verify my company's screen name "gravity": http://app.apigee.com/console/apigee-console-snapshots-1291179600000_ad72eb6f-05b5-4b31-b4a4-914777b2357b/rendersnapshotview -- Twitter developer documentation and resources: http://dev.twitter.com/doc API updates via Twitter: http://twitter.com/twitterapi Issues/Enhancements Tracker: http://code.google.com/p/twitter-api/issues/list Change your membership to this group: http://groups.google.com/group/twitter-development-talk
