Video Spamming?

Today while surfing youtube.com a thought comes in mind.Spammers are deriving new ways to spam the users on the internet like audio spam,pdf spam etc. what if they started using video spamming?
Imagine that you visit youtube.com and found a video that has some hot and sexy chicks photos,videos which endorse some viagra or other products.at the last they display a url from where you can purchase them.these URLs are classic old urls which you daily receives in your spam.for once many novice and even experiance users will open that URL?
Possiblities are endless,those links can contains some troajans,exploits which can install backdoor on your machines.
No IDS/IPS can detect such attacks,its very hard to figure out a URL in the video ;)
how will you protect from them?any ideas?post in comments.