According to an email apparently sent by Universal artist Colbie Caillat to her fans, artists signed to Universal Music Group or one of its subsidiaries may not post full versions of their songs on their MySpace pages.
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Update: Word on the grapevine is that this policy was enacted about six months ago, but that in many cases, artists were only recently notified. Universal has limited the music by artists on all of its labels to posting only 90 second samples on MySpace and other third-party sites, unless they have a contract with Universal that allows them to stream the full song on-demand. (Labels can also choose to add an audio tag to the beginning and end of the audio files rather than limiting songs to 90 seconds, but most are going with the 90-second sample option.)
The policy applies to any site where music can be embedded, except for Universal's own official sites, which still offer free on-demand streaming of certain complete songs.
Another Update: When Universal replaces the songs with 90-second samples, the songs maintain their current playcounts. But apparently, if an artist were to replace that with the full-length song (allowing fans to embed the full songs again), playcounts revert to an embarrassing zero plays.
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(original post via lefsetz)