In some embodiments, techniques for synchronization comprise connecting to a second data device; determining that a first item of multimedia content is more desired than a second item of multimedia content, based at least in part by determining that the first and second items of multimedia content are similar to a third item of multimedia content, and an explicit rating of the third item of multimedia content; determining a set of multimedia data to be synchronized from the second data device to a first data device, wherein the first item of multimedia content is included in the set of multimedia data and the second item of multimedia content is not included in the set of multimedia data; and synchronizing the set of multimedia data from the second data device to a first data device.