.I am checking some users to see if their Job Roles are really what they say - from a major bank. Let me say, I can find over 50% of the people through a simple "Linked In" search. And I am not trying really hard. When I have had to search for real details I can usually find about 80 - 90% of the people in question via the net. It is amazing.
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I find it helpful for work, and a little scary in real life.