Best way to Spam Links in Comments

You tube doesnt allow you to paste links...

We could for example use upside down text to paste the link, which would get through... ɯoɔ˙plɹoʍʇɐɥʞɔɐlq˙ʍʍʍ but still is not clickable and they would have to rewrite it while doing a head stand.

Any other creative suggestions?

There must be some other char sets we can use instead which would get through?

What does everyone do? The usual blahblah(.)com ??

Hey buddy, here is some useful information on leaving comments...
http://www.blackhatworld.com/blackhat-seo/youtube/98862-how-commenting-vids-can-make-money.html

Cheers