К примеру, чтобы вставить ссылку с идентификатором soF3t7cFPoc, в комментарии пишем:

<a href="https://www.youtube.com/watch?v=soF3t7cFPoc">
<img src="http://img.youtube.com/vi/soF3t7cFPoc/0.jpg">
</a>

Получаем:

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