Ever go to a party or charity event where there was a lot of important people and someone snapped a picture with you standing next to one? One you only knew in passing or met for the first time at that event? I doubt you would claim they were your buddy or friend. I doubt you know jack about there personal peccadillos either.
Ever had to speak to someone in a power position you never met before. Or maybe met in passing at some function that were at because your work crossed paths in an unaffiliated way. Ever had to give them a call because they were in charge of or a part of some business that was financing a business deal you were a part of. Maybe they were just funding a charity you worked with or in charge of their company's donation allotment for a charity you were associated with? Doesn't mean you knew them intimately, played golf with them. went to dinner with them every sunday, now does it.