I have noticed this strange behaviour too (duplicated results and unknown users). For instance, yesterday, when I tried to lookup for user 44537294 (with two different accounts), I received during many hours information about user 243784138, before receiving expected result (around 17/18h UTC).
David -- 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
