My Sexy Friend Needs Instant Traffic ASAP

Definitely Dating sites where the girl actually spends time messaging back and forth with guys making it a personable experience. People are getting fed up with regular cam models who just sit there and take requests, they want someone who already knows what they want(Just like anyone in any kind of relationship!) So put the types of things she likes on her facebook... and to post her own profile on pages of things she likes... so that other people that like those things can find her and subscribe to her events. Do you do mass facebook event invites?

You can try eBay for some advertising. Just select something small and sell it really cheap, a photo or whatever and be careful with their policies. It worked in the past.

Don't just limit the 'teaser' videos to Youtube. Upload it to all major porn sites with the link in the video. Also spam some adult chatrooms.