You can post YouTube, Google Drive, Dailymotion, Twitter, Facebook, vidme, Vimeo, VK and many other videos.
Example:

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https://www.youtube.com/watch?v=fHky0Dci0zU


Images can be posted using the "Insert image" button or by writing an img tag.
Example:

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[img]https://pbs.twimg.com/media/CqOMAyFWAAEC-1H.jpg[/img]
Image

You can also post some other types of media like tweets, imgur posts, pastebin, SoundCloud, etc.
Example:

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https://twitter.com/Drakath1/status/920709780024561673