http://choicelearning.blogspot.com/2008/02/list-of-white-label-application
List of “White Label” (Applications you can Rebrand) Social Networking PlatformsJeremiah Owyang has an extensive list (continuously updated thanks to a barrage of responses) of scoial networking software that can be use to create your own "white label" network. I note that one respondent advised him to add elgg - so I don't have to - also that Ben Werdmuller responded as well touting elgg.
Also see this techcrunch posting where Mark Hendrickson took Jeremiah's initial research and created a review of 34 of these toolsets (alas elgg was not among them).
