User blog comment:Sannse/Checking in and catching up/@comment-5772846-20130506235536/@comment-8-20130507165125

If it's clear you are just mentioning it as part of a conversation with a friend, and not trying to get them to move, I'm not so worried.

But it can sometimes be hard to see the line between that and spamming - I've seen people leave messages on new users' talk pages, or inactive users, or keep "just happening to mention it" on forum threads... and their reasoning can be that they are just talking to friends. So while I don't want to try and shut down all mention of the other wiki, I also ask that you be very careful that you are not promoting the other wiki.

And ToaMeiko: I would add that repeatedly linking to articles on the other wiki, when it's just as valid (and easier) to link to ones here, is also a kind of spamming