LOLapps titles include Critter Island, Garden Life, Diva Life, Band of Heroes, Supermodel: The Game, Yakuza Lords and Facebook versions of the big gaming titles Dante's Inferno and Champions Online, but visit any of those right now and you'll be greeted by Facebook's "Page Not Found" error, pictured below.
Social games are potentially very lucrative for Facebook, which has demonstrated its commitment to the form with the deployment of its Facebook Credits that can be used for in-game transactions. Thus, it'd be in the best interests of both Facebook and LOLapps to resolve this dispute quickly.
At first it wasn't clear why the games were dropped, but VentureBeat reports that a Facebook spokesperson said, "We have disabled applications from LOLapps due to violations of our terms." The spokesperson didn't specify which terms were violated.