It seems Disney began acquiring FanLib in May, 2008, and completed the process in June, two months before FanLib announced it was "closing."
I base this on the trademark records "Attorney Revoked And/Or Appointed" dated 5/28/2008, and "Automatic Update Of Assignment Of Ownership" on 6/11/2008. The first rumor of the buyout appeared June 3, 2008 -- a rumor FanLib denied right through its "closure" in August, 2008.
Disney now owns the FanLib trademark, which means it could resurrect it at some point; the FanLib software and servers presently support the Disney property Take180.com.
The FanLib trademark, classed as "Goods and/or Services," covers "providing temporary use of on-line non-downloadable software to facilitate the creation, conceptualization, and editing of a variety of movies, television shows, novels, plays, videogames, and other content or media, through user suggestions, concepts, ideas, collaboration, and voting."