Auto-postar vídeos do Youtube?

[Lilly (Lillian Louis)]

sounds similar to this feature request

Automatically post YouTube videos from a certain channel?

Is there a plug-in that pulls uploaded videos from YouTube from a certain channel and post it on the form like a automated message

might already be possible tho

Create automate Topics from Youtube Video?

You can do it using IFTTT. There using YouTube service you can create Discourse topics whenever new video uploaded in a particular subscribed channel. I was done it in my other Discourse instance successfully. For more details about how to connect Discourse with IFTTT see this tutorial. Alternatively there is an RSS poster plugin available below