then they will get red tagged and ignored,
I know why you say that 
If you listed a wrong person on your list, it could cause them some difficulties.
I'm sure 100%I don't know the reasons (probably JC is right), but the point is: is not for you to decide.
I thought it would be interesting to know who are the sources, but this is a good point will be respected.-----cut----
Maybe I'll send you a message to do analytics while maintaining privacy.Are there more suggestions?