Promotion
You cannot do commercial promotion here, so if your youtube site is in any way monetized or a solicitation, the answer is no, don't do it. And it's poor form to link from here to images / activities that would not be permitted here - notably, sexual sites and images. You are not allowed to post links in chat. But in the forums, you can, with items of general interest.
What if it is in NO way monetizing anything since I'm just starting up. I don't send any links anywhere except to a free youtube naturist travel channel. But that's okay, I'll keep plugging away as a monkey pasting all my stuff in other ways. hahaha Sorry if I sound rude, but it's hard to do mass promotion by yourself and everyone has different rules. THANKS that helps a lot.
I have seen people place links to their twitter accounts to share photos which are free. I'm not an administrator, but I would guess that as long as the youtube site were free you should be able to do the same think. Where I've noticed most of the twitter links have been on the person's home page under "About" on the right hand side.