User blog comment:X-145/Another Alternate History Wiki: Ridiculous Histories!/@comment-1630894-20120501002921/@comment-1630894-20120501010857

To quote the deriative works policy: "Derivative works are any timelines based on previously published material. This can take the form of fan fictions ("what if Darth Vader didn't die ?") or fleshing out timelines ("europe in Turtledove's timeline-191"). Derivative Works are not allowed on this Wiki even if only parts (such as characters)."

I see nothing against continuing one's own timeline or anothers with permission on another wiki.