Or more specifically by something their fiancé said on FB?
I'm recruiting a nanny at the moment, down to two excellent candidates. I slightly prefer one, DH slightly prefers the other. Did a search for my preferred candidate and went down a Facebook rabbithole that led me to her fiance's page (all totally open) on which he makes quite a few angry statements about various things (immigrants and gay people for instance) totally at odds to my own values. It has made me question my preference for this candidate but AIBU?