Today there are many media sharing applications that use diverse metadata formats to describe media resources. This leads to interoperability issues in cataloguing, searching and annotation. This situation poses schema matching algorithms in the eye of the storm of metadata interoperability. In: this paper we present two different solutions for multimedia metadata schema matching using variable linkage algorithms. These methods consist in directly comparing the data values stored in the different metadata variables, allowing to overcome the inherent limitations of schema-level matching approaches. We show the feasibility of these methods through some experiments with real metadata information extracted from the image hosting websites Deviantart, Flickr and Picasa.