This is a dedicated channel that emulates picture blogging images such as Instagram. These are the main things you can do as a player in this channel:

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If InstaMedia channel is enabled in your exercise, you can find it in the Virtual desktop by clicking the channel icon on the left menu. 

Once there, click on the + button to select an image (from file, camera or URL), write a caption and click Share.
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Type your comment on the text field available below each post to respond to it.