Adds the username of the registered user viewing the page into the page, so that with the code:
The following will be displayed:
The user reading will always see a compliment directed toward them and their userpage, no matter who they are.
The username replacement doesn't work for unregistered users, so instead they see a default value of "<insert name here>". To change this default, use the first parameter. For unregistered users, will display as "This user", and for registered users it will display as their username.
Use this template sparingly. Misuse of it (including, but not limited to, adding "{{USERNAME}} is stupid" to pages) may result in a ban.