The new FICO 8 score has all sorts of improvements for lenders, but here is one that I found very interesting...
They probably keep tabs on this and other forums to determine how we try and game the system 
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This was taken from the FICO 8 Score pdf on this page. The pdfs are under the evaluate tab.
This direct link should work: Direct Link to PDF
Start quote
Protection from authorized user abuse
The FICO® 8 Score also includes a modification designed to help protect lenders from authorized user abuse.
Over the last few years, lenders have become increasingly concerned about exposure to possible fraud by consumers who deceptively boost their score by paying to be added as an authorized user on someone else's seasoned and good credit account (a practice sometimes referrred to as "piggybacking"). Yet lenders also want the FICO® Score to continue to consider spousal authorized user trade lines to help support their compliance with federal regulations (specifically, ECOA Regulation B)².
In response to these needs, FICO scientists have invented an innovative way to include authorized user credit accounts in the calculation of FICO® 8 Scores, while materially reducing potential impacts to the score.
End quote
There is actually lots of great information on the www.fico.com about scores/scoring etc....
I kind of made a decision that I would not try to goof around with AU accounts for backdating purposes etc... Its stuff like this that makes me happy I made that decision.
What do you think of this?
