Once you have your tracks stored online on your Soundcloud account, you can then share the URL's on facebook, twitter, email or even have an embedded player on your own website.
Here's how to use the Share with SoundCloud feature:
2) Set your preferred file format and click the Share button. First time you will be asked to download the Soundcloud add-on. Click OK.
3) Click connect to SoundCloud and login. Register a free souncloud.com account if you dont have one already.
6) On success, the uploaded URL will be displayed. Copy the link to share your track on email, facebook or twitter.