You can share your musical tastes with other people by publishing your playlists on the iTunes Store. Shared playlists include 30-second previews of any songs in your playlist that are also available on the iTunes Store. If a song in your playlist is not available on the iTunes Store, the song isn’t listed in the shared playlist.
To share a playlist, select the one you want to share. Click the Publish arrow to the right of the playlist in the Source List. If you don’t see the Publish arrow, make sure the “Show links to the iTunes Store” checkbox is selected in iTunes > Preferences (Windows — Edit > Preferences).
Changes you make to your playlist after it’s published are not updated automatically on the iTunes Store. You need to click the Publish arrow each time you make a change that you want to share.