New York-based Ringleader Digital, which serves up ads for mobile devices, said it landed a contract with IAC (NSDQ: IACI) Ad Solutions, which includes such big-name properties as Match.com, Evite, Citysearch and others. Ringleader Digital said its network allows agencies and brands to easily bring their ads to mobile sites because it delivers ads by device functionality, not just device type, which means that advertisers aren’t limited by incompatible formats and aren’t burdened by the costs of designing and serving up multiple ad formats. Ringleader said additional inventory will be made available to advertisers as IAC Ad Solutions continues to roll out mobile sites throughout the year.