With VoiceThread, group conversations are collected and shared in one place from anywhere in the world. It can be compared to a subject-specific, text forum but focusing on audio instead of text. A VoiceThread is a collaborative, multimedia slide show that holds images, documents, and videos and allows people to navigate slides and leave comments in 5 ways - using voice (with a mic or telephone), text, audio file, or video (via a webcam). VoiceThreads can be embedded to show and receive comments on other websites and exported to MP3 players or DVDs to play as archival movies.
Resources required: 
Adequate bandwidth, cookies enabled, firewall access allowed, proxy setting for full functionality
Partially free. A free account does have some limitations on creation and video commenting.
Setup and configuration: 
No software has to be installed. For mobiles an app is available
The site is user-friendly and easy to manage.
Navigation and operation: 
The voicethread website is easy to use: all the section are labeled and organized. You can upload your own media files: images, videos, documents. Basics: Size: no single file can be larger than 25MB with a Free account, or 100MB with Pro and Educator
How to use it: 
To create your own VoiceThread You must have a VoiceThread account and be signed in. To comment on other peoples VoiceThread you must also have an account and the originator has not set any privacy options. To create a Voicethread: Click on the Create tab at the top of the page. Click the Upload button. Choose the source of your media. Select your file(s). VoiceThread will save your progress as you work. Once you are done creating your VoiceThread, you can go to your MyVoice page to see your newly created VoiceThread. Media from Flickr, FB and websites can be also uploaded by clicking on the appropriate button. The uploaded media can be modified at any time after being uploaded. A VoiceThread operates much like any media player. The main difference between VoiceThread and other players is that another layer of media surrounds the central media you've uploaded as slides. After you add an image, video, or document, viewers can advance through this central media by using the arrows at the bottom-right or bottom-left of the player. The next layer is created when you or others make comments on your VoiceThread. You can advance through comments using the arrows on either side of the Play button, or by clicking and/or dragging the ball in the timeline under the Play button. To leave a comment on a VoiceThread, you have several options: Audio from a Microphone Text from a Keyboard Video from a Webcam Audio from a pre-recorded Audio File Audio from a Telephone Comments once inserted could be nevertheless edited or deleted. VoiceThread's Doodler allows you to annotate any slide while you're recording a comment. Remember that a doodle is recorded along with your comment, so you must be making a comment in order to begin doodling.
Examples of use: 
VoiceThread is particularly useful in language learning as it allows users to record audio around a particular subject or theme as a collaborative exercise.
Other issues: 
As with all open tools, where users can add content, moderation should be considered.
Useful tips: 
Enabling notifications will allow you to receive a Daily Digest listing all comments recorded in the previous 24 hours on any VoiceThread that you created, that you have subscribed to, or that has been shared with you. There’s a mobile application called VoiceThread Mobile App that allows you to create, comment, edit, and share your VoiceThreads from your iPad, iPhone, or iPod Touch. Other useful link related to Voicethread is : Voxopop There are existing social networking communities for VoiceThread: VoiceThread - Classroom 2.0 Digitally Speaking / VoiceThread – wiki