Brianna Laugher wrote: <snip>
I am involved with the welcoming efforts on Commons, where we have a bot that places a {{welcome}} message on all newly registered users who have made at least one edit or upload. We invite users to give feedback on the message, which you can read here: http://commons.wikimedia.org/wiki/Commons_talk:Welcome_log
<snip>
Maybe it could be a feature in MediaWiki. I am not sure we want to create a dummy page each time a user create an account through.