Generates a link to a Twitter account using a provided username.
Usage
{{Twitter|USERNAME|displayusername=}}
"USERNAME" should be replaced by the username of the Twitter account you wish to link.
If displayusername=yes, then the username will be displayed in the link.
Example
{{Twitter|buddyretardbot}}
would output: Twitter
{{Twitter|buddyretardbot|displayusername=yes}}
would output: Twitter@yes