How can I find out when a user joined Twitter? Is there a way to do this on Twitter, or are there any web services to give me this info?
I accidentally found mytweet16.com and this service seems to provide this info. For example,
FenerbahceHaber joined Twitter on Aug 16th, 2009 (694 days ago).
The other answers don't work anymore. However, I found the site http://www.twitterjoindate.com, which works.