Vodafone show how to handle the switch from one Twitter handle to another. Converting (for whatever reason) from @Vodafone_Group to @vodafonegroup, they post one last tweet to point followers to the new account.
Note that they also redirect visitors in the bio, either to the new corporate Twitter account, or for customer service contacts on the corporate website. There are too many Vodafone Twitter accounts to list them all in the bio, so this is a good way of pointing visitors to a central point where they can find help.
We like this because it tidies up a loose end, and knits together the web estate.
Author
Lucy is Editor at Corporate Eye