The only way to upload a song onto Facebook is by video, so this is what I recommend:
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To put a song on your Apple device, you have to download the song onto your computer. Then you upload it into iTunes. Then you can sync iTunes with your device which copies the songs onto it.
To import GarageBand projects into Logic Pro, you can simply open Logic Pro and go to the File menu. From there, select "Import GarageBand for iOS Song" or "Import GarageBand for Mac Song" depending on the version of GarageBand you are using. Choose the GarageBand project you want to import and Logic Pro will convert it into a Logic Pro project for you to work on.
If the song from iTunes is protected then it cannot be imported into Garageband but other song files in the MP3, AAC, WAV or AIFF format can be dragged into Garageband's timeline to import them.
Have iTunes and GarageBand open simultaneously. Drag the songs you want into garageband and edit as you'd like. When you are finished click on share from the menu up top and select "Send Song to iTunes."
On youtube, there is a SHARE button that you can click on.After clicking it there are other buttons,in these buttons you click on FACEBOOK button.If you are logged in to facebook, automatically the song/video will be uploaded onto your wall. If you are not logged in to facebook, you will be asked to first sign in. Contributed by tru2k06@yahoo.com