We've recently had users complain about receiving messages that emulate our  emails. We are aware that some people have been creating emails to appear as if  they were sent from YouTube, and these seem to propagate phishing  websites.
If you think you may have received a suspicious link, hover  your cursor over the link to see where it's redirecting you (look in the lower  left corner of your browser's status bar). If the link doesn't direct you to  youtube.com, it's not from us.
If you've already clicked a suspicious  link, you may want to scan your computer with anti-virus and anti-spyware  software to discover any malicious software that may have been installed on your  computer without your knowledge.