Digital content delivery network Limelight Networks announced Tuesday that it has formed a strategic partnership with Small World Labs Inc., a developer of online social-networking software. According to Limelight, Small World will use Limelight's content delivery network to add high-end video functionality to the social and professional networks of Small World's clients. This, Limelight said, should enable Small World to create more compelling and reliable online communities. Based in Austin, Texas, Small World Labs provides online social-networking platforms for companies such as Oracle, The American Cancer Society, the Special Olympics and The Dallas Morning News. Limelight Networks is headquartered in Tempe, Arizona.