This tool by Signalhire is a great tool that well it does a lot. For one it finds contact info, social sites, allows you to save candidates profiles, view them later, down load them, upload others. It also has a search capability. Below you see what it found on a candidate, notice email, phone and social sites.
The Good: Good tool, cross searches site such as Linkedin, facebook, Twitter, github, meetup, G=+and more to get personnel information
The Bad: Only works on Linkedin
The Ugly: NA
Final Verdict: 4 / 5