Zscaler analyzes the safety associated with website links as noted below:

PC Magazine: Zscaler – Analyzes URL safety
http://securitywatch.pcmag.com/internet-crime/293516-zscaler-zulu-flags-dangerous-sites

Zscaler – Analyzes URL safety (Home Page)
http://zulu.zscaler.com/

QUOTE: Security experts constantly warn you to avoid clicking links in tweets, emails, Facebook posts, and so on. Even if the sender is a friend, the link might have been added by a virus. So does that mean you can never check out the latest viral video? Sure, you can do that. Just check the URL with ZScaler’s free Zulu URL Risk Analyzer first.