Several years ago (2007) I was very active on both MediaWiki and Wikipedia and of course had two accounts - one on each wiki. I am now getting active again, and just discovered that in 2015 my MediaWiki account User: Egfrank was deleted and moved to User: Egfrank~mediawikiwiki.I thought at first this meant that I would have one user account that would work on both Wikipedia and MediaWiki and that I could have a single talk page to handle messages from both wikis. However, if messages concerning MediaWiki are posted on my Wikipedia talk page - full URLs need to be used to reference mediawiki articles - which is not terribly convenient for me or anyone having to contact me. If I direct traffic to User talk:Egfrank (on MediaWiki) then I and people trying to contact me can use MediaWiki namespaces for links, BUT now I have (a) a talk page without a user (b) two talk pages to track rather than one.
So what is the best way to handle this?
1. Is there some way to use namespaces to link to MediaWiki user accounts and pages from within Wikipedia? It is not convenient to have to cut and paste long URLs in messages. Additionally there is room for error and miscommunication if someone is talking to me on Wikipedia about MediaWiki business - if there are links to articles in both MediaWiki and Wikipedia, the person will see a blue link and think they are leaving a MediaWiki link when in fact they are leaving a Wikipedia link.
2. Should I revert the delete of my mediawiki user page? If there is no way to handle the linking problem, then I really do need two talk pages, one on mediawiki and one on wikipedia. A talk page without a user page seems rather odd and confusing.
Best, User: Egfrank / User: Egfrank~mediawikiwiki (on MediaWiki)
https://en.wikipedia.org/wiki/User:Egfrank (on Wikipedia)