Thread:Mathmagician/@comment-4795804-20130719221823/@comment-4674838-20130720032314

I believe it is, using the skypeme: interwiki prefix. It's in Wikia's interwiki map, e.g. http://bloons.wikia.com/api.php?action=query&meta=siteinfo&siprop=interwikimap and search that list for "skypeme"

For an example of a page that uses this, see:
 * VSTF
 * w:Template:Infobox vstf