I noticed that the only way I could get this plugin working correctly in the user profile page was to insert the complete url.
I created a 'Twitter' field in the admin
When I go to the edit profile page, I had to input http://www.twitter.com/username
Could it be possible to get the plugin to input the http://www.twitter.com/ part so that all the user has to enter is their username?
I just think that would help to be more user friendly is all.
Other than that, plugin seems to work just fine