Best answer by Mathis
We do believe strongly in building a strong community on the site, with deep connections to other users - following people whose music you enjoy, leaving genuine comments on their tracks, etc. All of these things can lead people back to your profile and if they enjoy your music they will add and leave comments for you as well.
Additionally, here is a great guide for how to use SoundCloud to your advantage: http://on.soundcloud.com/creator-guide
All the best