>I work there

An adage about difficulty trying to convince someone whose salary depends on their not being convinced comes to mind...

Then how did FB display a lot of info about me, and recommended me all my contact list as friend recommendations when I created an account after not having one for 10+ years?

It's OK to wish to defend your company, but please do not lie; nobody forced you to comment here.

That you are that specific about P2 very clearly tells me that Facebook actually does create shadow profiles. I believe you that P2 isn't the basis of such profiles.