SOUND CLOUD
SoundCloud is an online service for recording, hosting, and sharing audio tracks. You can use SoundCloud to upload and share audio recordings that you have stored on your computer. SoundCloud can also be used for directly recording a spoken track. Afeatures of SoundCloud is the option to comment on tracks as they are playing. To make a comment just play the track, click on it, then type your comment in the comment box. Your comment(s) will be attached to the spot in the track that you clicked on while listening.(freetechforteachers.com)